CHANG TSI - Key Persons


Ada Sun

Job Titles:
  • Counsel Trademark Agent

Amy Liu

Job Titles:
  • Attorney at Law

April Hu

Job Titles:
  • Patent Attorney

Ason Zhang

Job Titles:
  • Partner

Bella Zhao

Job Titles:
  • Trademark Agent

Bing Xiao

Job Titles:
  • Patent Attorney

Carina Chen

Job Titles:
  • Patent Attorney

Cassie Liu

Job Titles:
  • Attorney at Law
  • Attorney at Law Trademark Agent
Cassie Liu is a trademark attorney at Beijing Office of Chang Tsi & Partners, mainly engaged in prosecution matters for clients overseas in the IP field. She focuses on all aspects of trademark rights, including applications and protection of trademarks, copyrights, and domain names. Clients she serves cover many fields including pharmaceuticals, hardware, electronic products, household appliances, food, finance, clothing, etc. She is skillful in providing professional legal advice to meet clients' requirements, providing comprehensive and multi-level legal services, to safeguard clients' interests to the greatest extent.

Chen Jianxun Law

Job Titles:
  • Lawyer

Connie Kang

Job Titles:
  • Attorney at Law

David Lee

Job Titles:
  • Partner

David Liu

Job Titles:
  • Partner
  • Partner Patent Attorney
David Liu, a New York attorney and Chinese patent agent, has more than 10 years of legal experiences in both the U.S. and China. David has significant experience representing multinational clients in patent litigation, patent prosecution and trade secret litigation throughout IP Courts, CNIPA and PRB in China, and USPTO and PTAB in the United States. He practices in a large variety of technologies, including telecommunication, computer software and hardware, integrated circuit, artificial intelligence, cloud computing, 3D, medical device, signal processing, image processing, consumer electronics, and automotive industry. David has a bachelor's degree on computer science and engineering and a master degree on diplomatic study. He graduated from the Pace University School of Law with a JD degree. Before joining Chang Tsi & Partners, David worked for Volpe & Koenig in Philadelphia, King & Wood Mallesons in Beijing for many years. David Liu also has rich experience in the filing, prosecution, and enforcement of design patents. He works with both domestic and international clients across various industries and can customize the services to meet the specific needs of individual clients. Using his expertise and knowledge, David helps to prepare and file design patent applications tailored to address the specific requirements in the client's jurisdiction and ensure the design patent rights are ensured.

Emma Ma

Job Titles:
  • Partner Attorney at Law Trademark Agent

Eva Hu

Job Titles:
  • Counsel

Franklin Fu

Job Titles:
  • Patent Attorney

Freda Han

Job Titles:
  • Partner

Helen Huang

Job Titles:
  • Attorney at Law

Irene Wang

Job Titles:
  • Patent Attorney
Irene Wang has been engaged in intellectual property rights since the end of 2015. As a microelectronics engineer, she worked in the Department of Assembly and Real-Time System at the Kaiserslautern Technology University in Germany. After returning to China, she joined an Intellectual Property Law Firm in Beijing. She is mainly responsible for preparing and filing foreign and domestic patent applications and offering consultation services for foreign and domestic customers (especially of Europe and the US), such as providing comments and responses in process of patent prosecutions. She is particularly specialized in preparing and filing German patent applications and providing consultation services to German and European clients in process of patent prosecutions. She has served many large foreign and domestic corporations and lots of small and medium-sized enterprises abroad (especially the enterprises in Germany, Austria and Switzerland).

Jerry Chou

Job Titles:
  • Attorney at Law
  • Counsel
Jerry Chou has worked as an attorney at law for nearly 19 years. He also has the same years of practice experience in the IP field. Such plentiful practice experience comes from his professional services in various cases involving trademark and copyright, such as administrative litigation for dispute over trademark, cases of civil infringement and criminal litigation regarding trademark, and litigation for copyright. Since Mr. Chou became a legal practitioner, he has offered services to clients from many industries, such as healthcare, communication, electronics, network designing, papermaking, real estate, computer hardware and software designing. He helped many Chinese and foreign clients to have their trademarks determined as a famous trademark in Taiwan, e.g., ELLE, BOYLONDON, Vanguard and Gibsong. During his nearly 19-year-career, Mr. Chou never confines his vision to Taiwan cases, and he used to give his clients the advice on overall planning for the comprehensive trademark layout in Asia using his integral and coherent perspective on legal protection. His rich experience in various trademark cases makes him a professional who can offer excellent services in IP protection to global transnational companies.

Jerry Wang

Job Titles:
  • Counsel

Joy Li

Job Titles:
  • Patent Attorney

Joyce Yan

Job Titles:
  • Patent Attorney

Junhong Chen

Job Titles:
  • Attorney at Law
  • Attorney at Law Patent Attorney
Junhong Chen specializes in matters related to patent infringement and invalidation actions in Taiwan. Mr. Chen obtained his Bachelor of Law from Fu Jen Catholic University. He gained extensive experience by working at Taiwan High Prosecutors Office Kaohsiung District as well as Taiwan Penghu District Court. His practice is mianly focused on IP, Corporate Law, and civil litigation. Mr. Chen has earned licenses to practice as an attorney at law and as a patent attorney. He has successfully helped to protect the IP rights of many well-known companies.

Juris Master

Juris Master (Chinese Law) / Juris Doctor (American Law), Peking University (2014)

Kaiming Bu

Job Titles:
  • Attorney at Law
  • Partner
Kaiming Bu specializes in civil and criminal litigation and foreign direct investment, as well as general corporate law matters. With many years of practical work and theoretical research, Mr. Bu has accumulated rich experiences and excellent litigation skills. Mr. Bu is also an adjunct lecturer at Anhui University Academy of Law. Since practicing, he has represented dozens of major civil and criminal cases including national influence, published many academic works, published more than ten articles, presided over and participated in more than ten national, provincial and ministerial law research projects.

Kevin Yuan

Job Titles:
  • IT Director and Head of IT of ChangTsi & Partners
Kevin Yuan is the IT Director and head of IT of ChangTsi & Partners. Prior to joining the firm, Kevin worked in Fortune 500 MNCs such as Lenovo, ExxonMobil and Royal Dutch Shell, as well as top law firm King and Wood Mallesons in management positions.

Laura Li

Job Titles:
  • Counsel

Leslie Xu

Job Titles:
  • Counsel

Lester Li

Job Titles:
  • Counsel
  • Counsel Trademark Agent
Lester Li is in charge of Hong Kong trademark matters in Chang Tsi & Partners. He used to work in Hong Kong Intellectual Property Agent Limited, underwent the comprehensive training of former Examiner of Hong Kong Intellectual Property Department. He also has vast experiences in trademark registration and protection all over the world, and provided services for many famous companies such as Lee Kum Kee, Chow Sang Sang and Meizu.

Lihan Yang

Job Titles:
  • Attorney at Law
  • Attorney at Law Trademark Agent
As the assistant of the founding partner, Lihan assists the founding partner and managing partner to handle legal matters and run daily operations, who is responsible for producing important materials required by partners' overseas visits, international conferences. As the director of client relations in the firm, she has led the team to win the bidding of new domestic and foreign clients many times. Meanwhile, she also manages and connects more than 130 global cooperative law firms and in charge of all trademark outbound cases of the firm. More than six years' academic background in law built her solid legal foundation and professional. At present, she not only serves as the outside legal counsel of Wilsonart, but also as the litigation attorney of Midea Group and Dart Industries Inc. and helped clients get many favorable judgments. Lihan has become a rising young lawyer in the IP field

Lilian Qiu

Job Titles:
  • Counsel

Lily Bao

Job Titles:
  • Counsel
  • Counsel Patent Attorney
Lily, as a dedicated Patent Attorney, plays a pivotal role in Patent Team, specializing in a wide range of patent-related services. Her core responsibilities include drafting patent applications, developing patent invalidity applications, overseeing patent reexaminations, and managing patent disputes. Lily's expertise extends to diverse technical domains, including Machinery, Electromechanical, AI, Autonomous vehicles, Big data, Intelligent transportation, Chip, Semiconductor technology, Optoelectronics. With her comprehensive knowledge and experience, she ensures that clients' intellectual property is managed with the utmost precision.

Lily Li

Job Titles:
  • Trademark Agent

Litian Xu

Job Titles:
  • Attorney at Law
  • Partner

Louisa Cheng

Job Titles:
  • Marketing Manager
  • Marketing Professional With over 8 Years' Experience of Formulating Multi - Channel Marketing Plans to Aid Business Growth.
As the marketing manager Louisa is the glue that brings our teams together and the driving force that keeps firm's business moving forward. Founding and developing the marketing department from scratch, Louisa now leads a team of 12, which help partners to maintain their clients and to secure a high level service quality. The key responsibility of Louisa's team is developing and implementing the

Matt Hou

Job Titles:
  • Attorney at Law

Michael Fu

Job Titles:
  • Attorney at Law
  • Partner
Michael Fu has focused his practice on intellectual property law for more than 15 years. He could provide intellectual property strategy with creative thinking for clients, and he has represented many Fortune 500 companies including Mondelez, HP, Under Armour, Michael Kors, Tiffany, Four Seasons, etc. He excels at helping clients with the enforcement of their IP rights through administrative and judicial channels in China. As a litigator and partner, Michael leads a professional team with more than 20 attorneys, paralegals, and legal assistants. He also teaches the young attorneys and associates with his knowledge and helps them to grow up faster. With his lead, he and his excellent team have won numerous high-profile cases which often attract the media's attention.

Michael Meng

Job Titles:
  • Patent Attorney
Michael MENG works as a Patent Agent in Chang Tsi & Partners, and he has been engaged in intellectual property matters since 2012. He has accumulated a wealth of experience including drafting of patent applications, OA responses, patent search, patent invalidation analysis, patent infringement analysis, etc. Michael speaks Chinese, English, and Korean, and he has provided patent legal services for LG Group, Hyundai Group, KIA Automobile, Michelin Group and other Fortune 500 companies.

Miffy Yen

Job Titles:
  • Counsel

Ming Hong Lian

Job Titles:
  • Lawyer

Ming Zhu

Job Titles:
  • Counsel

Mr. Michael Wu

Job Titles:
  • Partner
  • Head of Shenzhen Branch
  • Partner Attorney at Law Patent Attorney
Mr. Michael Wu is the head of Shenzhen Branch, specializing in matters related to patent infringement, copyright infringement, trademark infringement, and unfair competition litigation, enforcement of intellectual property rights through administrative procedures and patent invalidation proceedings. Mr. Wu has earned licenses to practice as an attorney at law and as a patent attorney. Wu has a unique understanding of mobile telecommunications patent litigation, software patent litigation, and copyright litigation related to the internet. Wu obtained his Bachelors and Masters Degrees in Material Science from Wuhan Technology University in 1996 and 1999, respectively. He further pursued a J.M/J.D. degree at Peking University, School of Transnational Law in 2014, where he systematically studied Chinese and American law. Prior to practicing law, Wu spent ten years in the field of mobile telecommunications, and founded a company specializing in mobile telecommunication services. He has been invited to serve as a member of the China Global Advisory Council (GAC) of INTA for 2022 - 2023. He is also a frequent speaker of IP seminars and client training courses regarding China's IP strategy.

Ms. Vicky Pang - CFO

Job Titles:
  • Chief Financial Officer
Ms. Vicky Pang is the Chief Financial Officer of Chang Tsi & Partners and will be entrusted by the Management Committee to be in charge of the financial operations. Before joining Chang Tsi & Partners, Vicky Pang worked as Finance Director in Beijing Ruibai Law firm ( PwC global member firm) , in charge of the finance operation for the PwC legal service line in China and HK. Before that, she worked as Finance Head (China) in DLA Piper LLP. With nearly twenty years of experience, Vicky Pang has gained extensive knowledge and deep insight in finance management domestically and internationally. In the most recent ten years, she has led regional teams in large international companies, worked closely with the senior management, provided strong support for key decision-makers, and built up good business acumen and compliance awareness.

Nana Zhang

Job Titles:
  • Counsel

Nancy Qu

Job Titles:
  • Partner
  • Partner Attorney at Law Patent Attorney
Nancy Qu specializes in the prosecution and enforcement of multiple intellectual property rights, including trademarks, patents, copyrights, trade secrets and domain names. Ms. Qu has over 15 years of experience as a litigation lawyer and patent attorney. She is experienced in the development of strategy in patent and trademark lawsuits, enforcement of effective judgments, as well as in negotiation strategy. She is specifically skilled at handling complicated and difficult IP infringement cases. Ms. Qu has successfully helped to protect the IP rights of many Fortune 500 companies. Nancy Qu is fluent in English and Chinese.

Nancy Zhao

Job Titles:
  • Attorney at Law

Pan Shen

Job Titles:
  • Attorney
  • Attorney at Law
  • Counsel
Pan Shen is an attorney who has been engaged in IP matters for 9 years. Before joining Chang Tsi & Partner, Pan once was an attorney of Beijing East IP Law Firm and the senior trademark counsel of Beijing Bitmain Technologies Ltd. She has extensive experiences in trademark, copyright and domain matters and could give the clients comprehensive suggestions on trademark protection strategy. For considerate, comprehensive and responsive services, she was highly praised and truly trusted by the clients.

Phoebe Xi

Job Titles:
  • Counsel

Rita Qiao

Job Titles:
  • Counsel
  • Counsel Attorney at Law Trademark Agent
Rita Qiao works as a trademark attorney in Chang Tsi & Partners, mainly engaged in prosecution matters for clients overseas in the IP field. She focuses on all aspects of IP rights, including applications and protection of trademarks, copyrights, and domain names. As of working in the field of intellectual property protection at the end of 2013, Rita has served several Fortune 500 companies and world-famous law firms and accumulated a wealth of experience in many prosecution and dispute resolution cases. Clients she serves cover many fields including industry products, electronic products, new energy, automotive, household appliances, e-commerce, fire & security, Jewelry and education, etc. She is skillful in providing professional legal advice to meet clients' requirements, providing comprehensive and multi-level legal services to safeguard clients' interests to the greatest extent. In addition, she is able to work on important, abundant and urgent cases both independently and collaboratively.

Ron Tsi

Job Titles:
  • Attorney at Law
Ron Tsi, attorney at law at Chang Tsi & Partners, has graduated from Fordham University with a L.L.M. degree in Intellectual Property Law. Ron primarily has been focusing on client relationship management by coordinating outbound cases since 2015. Also, with his concrete legal background in China, Ron has been assisting global start-up clients to design their China-Entry IPR strategy in a cost-efficient way. Throughout profound experiences in assisting global IPR clients including some leading companies in high-tech, food, and pharmaceutical field, he has in-depth IP expertise not only in China, but also US, and EU. Ron is a frequent attendee of INTA, MARQUES, and AIPLA, and has been actively giving a speech before Fortune 500 clients and universities.

Rose Xu

Job Titles:
  • Counsel

Runjun Sun

Job Titles:
  • Trademark Agent / Trademark Prosecution / Copyright & Domain Name / Beijing

Seo Dong Wuk

Job Titles:
  • Counsel

Simon Tsi - CEO

Job Titles:
  • Managing Partner

Snow Li

Job Titles:
  • Trademark Agent

Spring Chang

Job Titles:
  • Founding Partner

Sue Gui

Job Titles:
  • Counsel

Susie Pang

Job Titles:
  • Counsel

Tracy Bu

Job Titles:
  • Attorney at Law Patent Attorney
Tracy Bu has been engaged in patent-related intellectual property business since 2013. Her business scope includes patent application, OA response, patent search, patent invalidation analysis, patent infringement analysis, etc. She is proficient in three languages, including Chinese, English and Japanese, and is mainly responsible for overseas patent applications led by the United States, Japan and Europe, and has served famous companies such as Honda Group (Japan), Renesas Semiconductor (Japan), Canon (Japan), Nikon (Japan), Hitachi Group (Japan), YKK Corporation, ABB (Switzerland), Kohler, Electrolux and Outolive, providing professional patent legal services to them.

Tracy Shen

Job Titles:
  • Attorney at Law
  • Partner
Tracy Shen has practiced in the field of intellectual property law for over 10 years, with a focus on trademark law. She has in-depth experience in trademark litigation, trademark portfolio management and strategic counselling. Her experience covers all stages of the trademark lifecycle and consists primarily of procurement, opposition and cancellation proceedings, portfolio management, strategic counselling, civil litigation and enforcement. She is highly skilled in assisting with trademark portfolio management, including selecting trademarks with a particular value, filing, and enforcement strategies in accordance with clients' commercial objectives, preparing agreements related to the assignment of IP rights and setting up guidelines for properly promoting, advertising and using trademarks both in-house and externally. Her experience extends to internet-related subjects like domain name cybersquatting and social media. She also counsels clients regarding trade secret issues and non-disclosure agreements. Tracy also supports clients in the design and development of product packaging and labelling. She counsels clients on the intellectual property implications of label designs, and provides legal guidance regarding compliance with trademark and advertising regulations that impact product packaging, labelling, advertising, and promotion. Tracy Shen is fluent in both English and Chinese.

Vickie Wang

Job Titles:
  • Attorney at Law
  • Attorney at Law Patent Attorney
As a patent attorney, Vickie is mainly responsible for dealing with patent applications, patent reexamination, patent invalidation matters, and patent infringement and stability analysis. Vickie also offers related consultation services, especially for foreign customers. Her major technical fields include machinery, electromechanical, engineering technology, and design.

Vicky Zhang

Job Titles:
  • Attorney at Law

Yan Gao

Job Titles:
  • Attorney at Law
  • Partner
Yan Gao is specialized in civil litigation and arbitration, as well as general corporate law matters. In litigation and arbitration, Ms. Gao has represented many leading Chinese and international clients in labor disputes, contract disputes in construction projects, debt disputes, equity disputes, trademark infringement disputes and guaranty disputes.

Yanbo Wang

Job Titles:
  • Counsel

Yiannis Fanides

Job Titles:
  • Counsel
Yiannis is a Lawyer who specializes in Intellectual Property Law and Corporate Law. His wide knowledge in IP Commercial and his successful outcomes in complex cases have been the reason of him being regularly referred to throughout the years by International Firms and individuals. He represented several investors and entities who invested on large scale projects for both commercial and residential use within the Republic of Cyprus and has always met the clients' expectations by guiding them through the legal challenges. Yiannis has established an esteemed reputation in foreign markets. He is a member of the Uglobal Writers Council and the Investment Migration Council (IMC)

Ying Han

Job Titles:
  • Trademark Agent
Ying Han is a trademark attorney of Chang Tsi & Partners. Before joining Chang Tsi & Partners, she worked in ScienBiziP, the Foxconn's former Intellectual Property Department. She has been engaged in trademark agency since 2014 and has particular expertise in trademark clearance searching, applications, oppositions and invalidations.

Yuan Ma

Job Titles:
  • Attorney at Law Trademark Agent

Yue Liu

Job Titles:
  • Attorney at Law

Zehui Wang

Job Titles:
  • Attorney at Law Trademark Agent

Zhiling Zhao

Job Titles:
  • Attorney at Law
As an attorney at law, Zhiling has been engaged in intellectual property legal services since 2010 and has 11 years of experience. In many years of professional career, she has accumulated a wealth of experience. Zhiling is mainly responsible for legal cases of trademarks, patents, copyrights, and domain names, as well as customs protection of IP rights, raid action, unfair competition, litigation and dispute resolution. She has represented many well-known multinational companies to take actions for enforcement of intellectual property rights in China and can provide clients with corporate intellectual property strategy and comprehensive, multi-level, one-stop legal services.