Meet Your Providers

Eye Care Providers


Dr. Eric J. Kahle is a native of St. Louis, Missouri. He received his Bachelors and Masters degrees in Biology from the University of Illinois, and graduated with honors from the University of Illinois College of Medicine. Dr. Kahle then performed a year of internship in the General Surgery Department at Rush Presbyterian-St. Lukes Medical Center in Chicago, Illinois. He completed his Ophthalmology training at this same institution, serving as Chief Resident his final year. He practiced for two years in Danville, Illinois with an internationally known cataract and refractive surgeon. Dr. Kahle then joined Eye Associates as owner in 1998. Dr. Kahle is board certified by the American Board of Ophthalmology. He has special interest in the treatment of cataracts, glaucoma, diabetes, and eyelid abnormalities. Dr. Kahle takes pride in providing to patients the latest advances in eye care, which have been safely tested.


Dr. Gregory Perrone was raised in many locations, as his father served in the United States Air Force. Dr. Perrone eventually landed in Sonoma County, which has been his home for over 20 years. Dr. Perrone received his Bachelor of Arts degree in Microbiology from the University of California, Riverside, and then went on to get his Bachelor of Science in Physiological Optics and a Doctorate in Optometry from the University of California Berkeley. After receiving his degree, Dr. Perrone completed a residency in Low Vision Care at the VA hospital in Connecticut. Along with taking care of healthy eyes, the most rewarding part of his career is helping people with visual challenges through glasses or contact lenses. Dr. Perrone enjoys spending time outdoors with his wife and son.


Dr. Mary Lechner grew up in Pennsylvania. She attended Wayne State University in Detroit Michigan and University of California at Berkeley from which she received her Bachelor of Science degree in Physiological Optics as well as her Doctor of Optometry Degree. Dr. Lechner has practiced optometry in numerous settings throughout her career. She enjoys all aspects of eye care – particularly educating patients about their eye health, visual requirements and optical options available. Northern California has been home to Dr. Lechner for over 35 years. She enjoys using recycled and reclaimed objects and materials to make furniture and art. She and her husband, a guitar maker, also enjoy designing and making wood furniture.

Skin Care Providers


Randall Hrabko, M.D., F.A.A.D. practices general, cosmetic and surgical dermatology. He received his medical degree and dermatology training from the University of Miami, as well as advanced training in skin cancer surgery, Mohs micrographic surgery, reconstructive surgery, and cosmetic surgery at the Roswell Cancer Institute in Buffalo, New York. Dr. Hrabko is board certified by the American Board of Dermatology and is a fellow in the American Academy of Dermatology for over 25 years. He is also a ten year member of the American Holistic Medical Association and applies his holistic skills in the diagnosis and treatment of his patients. He is known by his colleagues and patients for his compassionate and professional care.


Gregory Hadfield, Physician Assistant (PA-C) joins our practice with over 20 years experience.

Greg is a graduate of Stanford University Physician Assistant Program, previously earning a Stanford Bachelor’s degree in Human Biology.

Greg has 14-years of full-time dermatology experience: 12-years in Lake County, initially with Lake Dermatology, and serving Lake County Tribal Health Consortium as a dermatology provider.  He performs all aspects of medical/clinical/surgical dermatology and has a special interest in diagnosing and treating skin cancer. Patient education is also key to his practice.

He is a 20-year U.S. military combat veteran with deployments to multiple war-zones, always as a member of a special operations team.

In his off time, Greg volunteers with Wounded Warriors and other special needs populations as an adaptive ski instructor.

Greg is a native of California and is happily married to a native of Lake County.


Erin Hanauer, Physician Assistant (PA-C) is a native of Arcata, California. She graduated
Summa Cum Laude from California Polytechnic State University with a B.S. in Psychology and went on to get her Masters in Medical Science and Physician Assistant Studies at Emory University School of Medicine. She graduated with Highest Honors.
Erin practiced at the Emory University Hospital from 2006 to 2011 and then moved to Sonoma County. Erin has been providing Dermatology services to Sonoma County residents since 2011. She specializes in skin cancer screening exams and treatment, treating acne and skin rashes, as well as providing cosmetic botox services to patients.
Raising a family in Sebastopol, she wanted to work close to her home and serve the community where she lives.


Sharon Hale, RN is a native of Sonoma County and has been providing BBL/IPL cosmetic facial rejuvenation treatments for over eight years. We are happy to have her as part of our team.


Andrea Frederick, MSN, FNP is an expert in facial rejuvenation using combination therapy to produce both natural and conservative results. Andrea began her medical studies at UCSC, where she completed a bachelor’s degree in biology, and then went on to earn a master’s in nursing and a post-master’s nurse practitioner certification. Andrea has extensive experience with injectable neuromodulators such as Botox and Juvederm volumizing fillers. Andrea also performs laser and light treatments.


Tanya Mora is passionate about her work and is constantly furthering her education and keeping up with the advancements in the industry. She educates her clients, guiding them to their best skin potential. Her treatments are result oriented while still maintaining relaxation. She looks forward to providing a level of personalized service that is unmatched.