TREEMASTERS - Key Persons


Bradley Hambrick

Bradley joined the TREEMASTERS team in 2023 and has been working in the industry since 2002. His more than 20 years of experience have been spent focusing on arboriculture operations, safety, and efficiency. He is a board member for a Sonoma County non-profit dedicated to helping underprivileged families.

Michael Queirolo

Michael joined the TREEMASTERS team in 2002. Beginning with performing tree work in the field, over the course of several years, Michael gained the knowledge to allow him to become an ISA Certified Arborist with a Tree Risk Assessors Qualification. Michael has dedicated himself to providing our clients with knowledgeable, high-quality tree care. Michael enjoys spending time with his grandchildren, as well as participating in cold-weather sports and snow caving.

Patrick Shand

Patrick joined the TREEMASTERS team in 2017 and has been working in the industry since 2005. He is one of our lead foreman as well as an arborist that excels at providing our clients with high quality tree care. In his free time, Patrick enjoys camping, martial arts, and spending time with his children.

Tad Jacobs

Job Titles:
  • Owner
  • Owner / I.S.a.
Owner Tad Jacobs has been providing Marin County with quality tree care since 1987. With Tad's drive and vision TREEMASTERS has grown into one of Marin County's most recognized and respected tree care companies. TREEMASTERS is a TCIA Accredited Company and is honored to have this recognition. Tad, a member of the " TCIA Peer to Peer Group" a group of business leaders in the tree service industry from all over the US as well as Canada, that get together and share ideas, business strategies and their experiences. Tad is now a Board Member of the TCIA, the world's largest Arboricultural Trade Organization, representing over 2300 tree care firms worldwide. Tad is heavily involved and dedicated in continuing his education and training to stay current with the latest developments in the tree care industry in order to provide our clients with the highest quality service. Tad is currently an I.S.A. Certified Arborist with a Tree Risk Assessment Qualification, a Certified Tree Care Professional and Licensed by the State of California as a Qualified Applicator. Tad is an austere leader with safety being the #1 priority for the production teams in the field. Tad has established a rigorous safety training regime for new field team members as well as the seasoned team members who have been with the Company for decades. When Tad is not out and about meeting with clients, running crews or managing his business, this Marin County native enjoys cycling and mountain biking along the trails of scenic Marin County. Tad Jacobs founded Treemasters in 1987 with three very simple principles: Honesty, Integrity, and Craftsmanship. Even after over 35 years, those principles continue to be our pledge to our clients. Our mission is to:

William Cross

We are pleased to introduce William, who joined TREEMASTERS as an arborist in 2022. William has been passionately involved in tree care since 2018 and has dedicated his time to honing his skills in this field. Growing up, William always had an interest in trees, and at the young age of 11, he started growing Bonsai trees. Through this pursuit, he found his love for pruning and tree work and began working on his own. Besides his work, William enjoys swimming, hiking, and working with his Bonsai trees. He brings a wealth of knowledge and experience to TREEMASTERS, and we are excited to have him on board.