FIRST COAST MOHS - Key Persons


Keith Hatfield

As a Physician Assistant with over 25 years experience, Keith has enjoyed caring for patients with a variety of dermatological needs. Prior to joining our group at Dermatology Associates of First Coast Mohs, he was the senior PA at Dermatology Associates of Tallahassee, one of the busiest Mohs practices in the Southeastern United States. There, he gained extensive experience in diagnosing and managing skin cancers, and performed thousands of procedures including biopsies, excisions, suturing, and closures.

Lanai K.B. Cooksey

Lanai began her medical career after receiving her Bachelor of Science in Exercise, and Sport Science at the University of Florida and worked in Cardiac Rehabilitation for approximately 1 year. She then furthered her medical career by obtaining a Masters of Science in Physician Assistant Studies at South University in Savannah, Georgia. Lanai has been practicing as a Physician Assistant since 2004 in the fields of Dermatology, Plastic Surgery, and Urgent Care Medicine. Lanai has a gentle touch and strives to provide a professional, and personal service while caring for her patients. When Lanai is not caring for patients, she enjoys exercising, fishing, watching football, traveling, and spending time with her family.

Rachel Warren

Job Titles:
  • Certified Nurse Practitioner
Rachel Warren is a board-certified Nurse Practitioner who specializes in medical, cosmetic, and surgical dermatology. After graduating from Florida State University, Rachel earned her Bachelor of Science in Nursing from the University of North Florida and her Masters of Science in Nursing from South University. After starting her nursing career in dermatology five years ago, Rachel decided to pursue her dreams of becoming a Nurse Practitioner. Rachel is passionate about medical and cosmetic dermatology and enjoys the balance of both specialties. After earning her Nurse Practitioner degree, Rachel trained directly under Dr. Warren and Dr. Howard for one year, where she acquired substantial experience and skills in evaluating and treating skin cancer, acne, and other dermatologic disorders. Her attention to detail and a keen eye for recognizing every patient's natural beauty led to her passion in caring for patients for their aesthetic needs. Rachel enjoys getting to know each and every patient while providing compassionate, quality care. She believes in educating and involving patients in their treatment plans to achieve optimal results. In her spare time, Rachel enjoys taking her two dogs to the beach and park, traveling to new places, and spending time with her family and friends

Simona Sipos

Simona Sipos, PA-C completed her undergraduate studies at the University of North Florida and received her Master of Science in Physician Assistant Practice at Florida State University. After completing her medical training, Simona was excited to come back to Jacksonville to provide care to the members in her community. Prior to working at First Coast Mohs, Simona practiced as a Physician Assistant in Family Medicine where she found a love for helping patients with different skin ailments. Simona enjoys developing long-lasting relationships with her patients and helping individuals feel best in their own skin. She now treats a variety of skin conditions as she performs several skin exams each day. When Simona is not working, she enjoys traveling, spending time with family and friends, reading and going to the beach with her long-haired, adorable, dachshund.

William C. Hund

Job Titles:
  • Fellow of the American Academy of Dermatology
Dr. Hund is a board-certified Dermatologist. He received a Bachelor's of Science degree in Biology from University of Pittsburgh. He earned his medical degree at Lake Erie College of Osteopathic Medicine's Bradenton campus and completed a one-year medicine internship at Good Samaritan Regional Medical Center in Corvallis, Oregon. He completed his dermatology residency in Miami at Larkin Community Hospital's Palm Springs Campus, where he served as chief resident. He now sees patients at our office in Fernandina Beach. Dr. Hund is a Fellow of the American Academy of Dermatology and member of the American Society for Dermatologic Surgery. Dr. Hund is passionate about giving back to the community and treating all dermatologic concerns. He has received extensive training in medical, surgical, and cosmetic dermatology on patients of all ages and skin types. He enjoys traveling, skiing, and spending time with his family.