Treiber Dermatology was founded by Dr. Ruth Treiber, a board-certified dermatologist, and Westchester native over 30 years ago. She started by renting a room across the street and eventually built the practice as it stands today. She has seen many patients for 30+ years and enjoys taking care of entire families over the years. Her husband, Dr. Eric Treiber, practiced general internal medicine for ten years before deciding to complete a second residency in dermatology. He has been practicing medical dermatology along her side ever since. Dr. Leah Ansell joined the Treiber Dermatology team in July 2021, having moved from Manhattan to Westchester. Dr. Ansell trained under the Treibers and Dr. Engler during her time at Columbia and it was a natural home for her after leaving the city.

Our philosophy is simple – we treat you like we would our own family members. We pride ourselves on providing personalized, compassionate, honest care to our patients. We enjoy being dermatologists to our community and treating the entire family.

In the age of corporatized medicine, we have held tightly to our private practice model. At our office, you will never interact with a call center. Instead, you will be greeted by our receptionists and staff members, many of who have been with our practice for 10+ years.

Our team of hand-selected, top-level doctors provides the most comprehensive dermatologic care, in a boutique, private setting, providing top level medical, surgical and cosmetic dermatologic care.

Education and Training to Become a Board-Certified Dermatologist

We are proud that every doctor in our practice are all extensively trained board certified dermatologists.

What our training entails:

  • Minimum Years of Supervised Education After College
    8 years of medical school and internship/dermatology residency
  • Number of Exams Required to Obtain License
    3 medical licensing exams and 1 dermatology board exam (with ongoing continuing medical education required yearly)
  • Minimum Patient Care Hours Required PRIOR to Unsupervised Practice
    12,000-16,000 hours
  • Board certification by the American Board of Dermatology
  • We are committed to ongoing medical education to stay up-to-date on cutting edge research and therapies, attending top conferences, being on-staff at Columbia, training the residents and participating in Grand Rounds

Meet Our Doctors

Ruth Treiber, MD, FAAD

Dr. Ruth Treiber
Dr. Ruth Kaplan Treiber graduated from Cornell University’s College of Arts and Sciences in Ithaca, N.Y. and received her MD degree from Cornell University Medical College in New York City. After two years of Internal Medicine study at The New York Hospital-Cornell Medical Center, she continued her training with a residency in dermatology at Columbia Presbyterian Hospital. She has been in active clinical practice since that time, practicing in Rye, NY since 1983.

Dr. Ruth Treiber is an Associate Clinical Professor of Dermatology at the College of Physicians and Surgeons of Columbia University and an Associate Attending in Dermatology at the Columbia Presbyterian Medical Center, New York. She is involved in the education of dermatology and medical residents and students at Columbia Presbyterian, where she assists in clinics and attends continuing education conferences. She is an active member of several committees within Columbia’s Department of Dermatology, which deal with medical education as well as clinical dermatology issues.

Dr. Treiber’s main areas of interest include treatments for aging or sun-damaged skin (including Botox, fillers, and lasers), acne, skin cancer detection and prevention, and ongoing patient education to enhance optimal skin health and appearance. Dr. Treiber is known for her meticulous skin cancer screening exams and thorough, thoughtful care for her patients.
Dr. Ruth Treiber is a board-certified dermatologist (The American Board of Dermatology). She is a Fellow of the American Academy of Dermatology, a Fellow of the American Society for Dermatologic Surgery, a member of the American Medical Association, Westchester County Medical Society, and several other professional organizations. She has been listed in ‘The Best New York Metro Area Doctors (Castle-Connolly Medical Ltd.), in New York Magazine’s The Best Doctors in New York, and in Westchester Magazine’s The Best Doctors in Westchester.

Eric Treiber, MD, FAAD

Dr. Eric Treiber
Dr. Eric S. Treiber graduated from Queens College in New York and received his M.D. degree from Georgetown University School of Medicine in Washington, DC. He completed his training in Internal Medicine at The New York Hospital-Cornell Medical Center and is board-certified in Internal Medicine. He was a full-time faculty member at Cornell University Medical College for two years. He then practiced Internal Medicine in Port Chester for ten years, while continuing to teach as a member of the Cornell faculty. He returned to train in Dermatology at New York Medical College, where he served as Chief Resident. Since then, Dr. Treiber has maintained an active dermatology practice in Rye, with special interests in dermatologic surgery and skin cancer treatment, sclerotherapy for leg spider veins, psoriasis (including phototherapy and new biologics) as well as demonstrating particular skill in procedures for children.

Dr. Eric Treiber is board-certified in Dermatology. He is a Fellow of the American Academy of Dermatology, a Fellow of the American Society for Dermatologic Surgery, a Fellow of the American College of Physicians, a member of the American Medical Association, Westchester County Medical Society, and several other professional societies. Additionally Dr. Eric Treiber is a Clinical Associate Professor of Dermatology at Columbia University College of Physicians and Surgeons. He is involved in teaching and lecturing, attends continuing education conferences, and participates in nationwide surgical meetings.


Dr. Leah Ansell
Leah Ansell, MD, FAAD is a cosmetic trained, board-certified, dermatologist with award-winning experience in medical and cosmetic dermatology. She is a local Westchester mom to three children.

Dr. Ansell, a third generation physician, grew up in the Chicago-area and graduated cum laude from Dartmouth College. She earned her medical degree from Northwestern University Feinberg School of Medicine, where she was elected to Alpha Omega Alpha, the national medical honors society for top graduating medical students. She was also awarded the Phi Rho Sigma Prize for highest overall standing and best performance in medical school. Dr. Ansell completed her Internship in Internal Medicine at Memorial Sloan Kettering Cancer Center, followed by Dermatology Residency at Columbia University New York Presbyterian Hospital, where she served as Chief Resident. She received dedicated, specialized cosmetic training through the ASDS with Dr. Ellen Gendler (Manhattan) and Dr. Tina Alster (Washington, DC).
Dr. Ansell practiced for years on the Upper East Side of Manhattan along-side Dr. Ellen Gendler at Gendler Dermatology. She brings her years of experience and expertise to Westchester. She enjoys providing compassionate and comprehensive dermatologic care for the entire family. She enjoys the artistry of cosmetic dermatology and specializes in facial aesthetics and rejuvenation. The goal of all aesthetic treatments, in her view, is to achieve and maintain a natural, refreshed look. She believes in distinguishing the “forest from the trees;” helping patients achieve overall improved proportions and balance, rather than chasing one line. She employs a multimodal approach to patients- using neurotoxins, fillers, radiofrequency, microneedling and lasers to help achieve the best outcomes. She has a particular interest in treatment of acne scarring, melasma, rosacea, sun damage/freckling and PRP (platelet rich plasma) for hair loss. Dr. Ansell also cares for a variety of medical skin conditions with particular emphasis on acne, rosacea, hyperpigmentation and skin cancer screening.

Dr. Ansell is an Assistant Professor of Dermatology at Columbia, where she teaches cosmetic techniques to the dermatology residents. She is a Fellow of the American Academy of Dermatology (AAD) and member of the American Society for Dermatologic Surgeons (ASDS), American Society for Laser Medicine and Surgery (ASLMS), and Women’s Dermatologic Society (WDS). She has participated in many medical mission trips over the years and has traveled to Haiti, the Dominican Republic and Rwanda to provide medical care.
When not seeing patients, Dr. Ansell can be found making new recipes, hosting friends, reading her Kindle, or (mostly) chasing after her three children.


Dr. John Nia
Dr. Nia specializes in skin cancer treatment. Dr. Nia is an expert in facial reconstruction, and a skilled surgeon, as well as a thoughtful aesthetic clinician.
Treiber Dermatology has fellowship-trained Mohs surgeons, and will take care of your skin cancer – complete care from start to finish.

Dr. John Nia is a fellowship trained practicing dermatologic and cosmetic surgeon. His training background is a unique blend of medical and surgical training in cutaneous oncology and facial cosmetic surgery.

A native New Yorker, Dr. Nia graduated with honors from an accelerated 7- year program at the City University of New York where he combined undergraduate studies with his medical degree. He continued his training as an intern at Lenox Hill Hospital before completing his dermatology residency at Mount Sinai, where he was selected as chief resident.

He was fellowship-trained at Clinic 5C under Dr. Cameron Chesnut. His fellowship featured an integration of facial plastic surgery, oculoplastic surgery, and dermatologic surgery. Through this integration, Dr. John Nia has become a well-rounded and facial reconstructive and cosmetic surgeon with an expertise in medical and surgical skin cancer treatment, plastic reconstruction, cosmetic surgery, as well as laser and aesthetic dermatology.

Outside of managing and treating skin cancer, Dr. Nia has a particular interest in cosmetic blepharoplasty, laser resurfacing, and regenerative medicine through the use of adipocyte derived stem cells.

Margot Chima MD, FAAD

Margot Chima MD, FAAD
Margot Chima MD, FAAD is a thoughtful and dynamic board-certified dermatologist with a primary focus on general and cosmetic dermatology.

Dr. Chima was born in Westchester and raised in Michigan. She attended the University of Michigan, graduating with honors. She was awarded a scholarship to attend the University of Nebraska Medical Center for medical school, where she also graduated with honors. Dr. Chima completed her dermatology residency training at the Icahn School of Medicine at Mount Sinai where she was selected by her faculty and peers as chief resident.

Exceling in providing patients with personalized, holistic, and up-to-date medical and cosmetic treatments, Dr. Chima has published dozens of articles, book chapters, and abstracts. She has been the study doctor on more than 35 clinical trials for conditions like acne, wrinkles, eczema, and psoriasis. She is sought after for helping patients achieve their natural cosmetic goals with minimally and non-invasive techniques like biostimulatory fillers, neuromodulators, platelet rich plasma (PRP), and energy-based devices.

Dr. Chima is an active member of the American Academy of Dermatology (AAD), American Society of Dermatologic Surgeons (ASDS), Women’s Dermatologic Society (WDS), and American Society for Laser Medicine & Surgery (ASLMS). She serves on the AAD Practice Operations Committee and was selected as a member for the ASDS Future Leader’s Network.

When not caring for patients at The Dermatology Specialists, she is a Clinical Instructor at the Icahn School of Medicine at Mount Sinai where she loves teaching the dermatology residents. Dr. Chima enjoys cooking, playing tennis, and watching Jeopardy with her husband, a Westchester native.