PremierMED Providers

Gary Visser, MD, FAAFP

• Board Certified Family Physician; American Board of Family Medicine
• Fellowship trained in Sports Medicine; USF-Morton Plant Mease Family Medicine Residency

Hometown: Harare, Zimbabwe
Education: Bachelors in Exercise Physiology; Doctor of Medicine, Florida State University College of Medicine.

After growing up in the Dr. Phillips area, Gary received his undergraduate degree in Exercise Physiology at Florida State University, where he also competed on the track and field team in the decathlon. He graduated from FSU’s College of Medicine’s third class, and completed his residency training in Family Medicine at the USF-Morton Plant Mease program. Dr. Visser’s passion for athletics inspired him to pursue a fellowship in Sports Medicine. There, he worked closely with the Philadelphia Phillies MLB team, USF athletics, and the IRONMAN 70.3 World Championships. Dr. Visser believes in hearing your personal story to customize recommendations for your unique situation, helping you discover and reach your goals. His professional philosophies integrate nutrition and fitness, preventative medicine with proactive education, and encouraging a balanced life. Gary cherishes time with his family and friends, as well as training for triathlons. He would be honored to serve as your primary care physician at PremierMED™| Family & Sports Medicine.

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“Was able to get an appointment in a reasonable time, wait in office was reasonable and I am impressed with Dr Visser”

Adam Langley, MD, FAAFP

• Board Certified Family Physician; American Board of Family Medicine
• USF-Morton Plant Mease Family Medicine Residency

Hometown: San Diego, California
Education: Bachelors in Exercise Physiology; Doctor of Medicine, Florida State University College of Medicine.

After growing up in Florida, Adam received his undergraduate degree in Exercise Physiology at Florida State University and was a part of the third class to graduate from the FSU College of Medicine. Dr. Langley’s residency training was completed in Clearwater at the USF-Morton Plant Mease Family Medicine Residency. While there, he also enjoyed working with athletes in the IRONMAN 70.3 World Championship. Adam believes in hearing your personal story to customize recommendations for your unique situation, helping you discover and reach your goals. His professional philosophies integrate nutrition and fitness, preventative medicine with proactive education, and encouraging a balanced life. Adam cherishes time with his family, close friends, and sports such as surfing. He would be honored to serve as your primary care physician at PremierMED™ | Family & Sports Medicine.

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“Dr. Langley is excellent. Took extra time answering questions. Cutting edge.”

Ed Roberts, MD

• Board Certified Family Physician, American Board of Family Medicine
• Hofstra Northwell School of Medicine at Phelps Hospital Residency

Hometown: Windsor, Ontario, Canada
Education: Bachelors of Science with Honors from University of Western Ontario; Doctor of Medicine AUC School of Medicine; Hofstra Northwell School of Medicine Residency.

Ed Roberts, MD was born in Canada where he earned his Bachelor of Science with honors specialization in genetics from University of Western Ontario. He graduated from AUC School of Medicine where he also met his wife, Anri. He completed family medicine training at Hofstra Northwell School of Medicine at Phelps Hospital Program in Sleepy Hollow, NY. Having trained in full spectrum medicine extending from pediatrics, women’s health and geriatrics, he is accepting both new and existing patients. He is an avid sports fan and continues to play hockey in the sunshine state. He enjoys traveling, spending time with his wife and daughter. He would be honored to serve as your primary care physician at PremierMED™ | Family & Sports Medicine.

Carolyn Knopfle, ARNP

• Board-Certified Family Nurse Practitioner with the American Association of Nurse Practitioners.

Hometown:  Gainesville, Florida
Education:  Bachelors in Public Relations, University of Florida; Bachelors in Nursing, University of North Carolina – Chapel Hill; Masters in Nursing, Georgetown University

A Gainesville native, Carolyn stayed in her hometown to attend the University of Florida where she earned a Bachelors in Public Relations. She then went on to earn her Bachelors in Nursing from UNC-Chapel Hill. She returned to Florida and worked as a RN in the Neuro ICU at UF Health Shands Hospital. While she loved the fast pace of the hospital and caring for critically ill patients, Carolyn felt that she could do the most good in primary care by educating her patients on lifestyle modifications for disease prevention. This prompted her to continue her education, and she earned her Master’s in Nursing at Georgetown University. After graduation, she worked in an Endocrinology practice in Gainesville where she gained valuable experience caring for complex patients with diabetes, thyroid disease and other endocrine disorders. In her spare time, Carolyn enjoys cycling, running and spending time with her family. She would be honored to serve you by providing your primary care medical services at PremierMED.

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“The doctors and in particular the Nurse Practitioner Carolyn Knopfle LISTEN. I have not had that for years.”

Dr Matthew Pierce Ganovsky, MD

• Board certified for American Board of Family Medicine
• USF-HCA Florida Oak Hill Hospital Family Medicine Residency

Hometown: Windermere, Florida
Education: Bachelors in Biology; Doctor of Medicine, St. Matthews University School of Medicine.

After growing up in Central Florida, Pierce received his undergraduate degree in Biology at Rollins College in Winter Park. He graduated from St. Matthews University School of Medicine. He completed his training in June 2023 with USF-HCA Florida Oak Hill Hospital Family Medicine Residency Program. During his training he served as Chief Resident for the program. His training consisted of serving a large geriatric population and underserved patient populations. He believes in a direct personal approach to patient care to achieve full body wellness including an integration of nutrition, fitness, preventive medicine, and proactive education.

Pierce cherishes time with his family, friends and hobbies such as weightlifting. fishing and tennis.

Ruth Hey, APRN

Hometown: Lake Charles, Louisiana
Education: Bachelor of Arts and Master of Education from Louisiana State University
Bachelor of Science in Nursing Wright State University Master of Science in Nursing Purdue University.

As a Louisiana native, Ruth earned her Bachelor of Arts and Master of Education degrees from LouisianaState University in Baton Rouge. While her husband was stationed at Wright Patterson Air Force Base,Ruth earned her Bachelor of Science in Nursing at Wright State University in Dayton, Ohio. She recently completed her Master of Science in Nursing at Purdue University Global and is Board Certified by the American Academy of Nurse Practitioners (AANP) as a Family Nurse Practitioner.

With more than 15 years’ experience working at Arnold Palmer Medical Center’s Level 1 Trauma Center and Winnie Palmer Hospital, Ruth is excited to join the team at PremierMED to provide personalized care to the community in which she has been a member for over 20 years. Ruth is an enthusiast of lifelong learning and plans to become a North American Menopause Society Certified Menopause Practitioner to help midlife women achieve their fullest health potential in the present and future years.

As a two-time Boston Marathon and two-time Ironman finisher, Ruth values lifestyle interventions to promote optimal health, such as nutrition, regular exercise, sleep protection, and stress reduction. Ruth enjoys spending time with her husband and four children, reading, playing piano, running, and gardening.

Lesley Jereissati, PA-C

Hometown: Fortaleza, Brazil
Education: Bachelor of Interdisciplinary Studies with a Minor in Health Science from University of Central Florida Master in Physician Assistant Studies Milligan University.

After growing up in Brazil, Lesley relocated to the Orlando area after High School.
Lesley received her AA at Valencia before attending University of Central Florida  to earn her Bachelor of Interdisciplinary Studies with a minor in Health Sciences. Lesley attended Milligan University in Tennessee where she earned her Master in Physician Assistant Studies (MPAS).

Lesley began her medical career as a scribe where she traveled to a number of nursing facilities in the Central Florida area supporting different primary care providers, before expanding to Medical Assistant for a Cancer Care Center. In 2024 Lesley received her certification as a Physician Assistant.

Lesley is passionate about connecting with people through small acts of kindness she is committed to the health and well being of her patients by building a strong foundation of trust and empathy.
In her spare time she enjoys bike riding, roller skating, and jogging with her furbaby Leo, an Australian Shepherd.