Our Staff

Oriane Szekelyhidi

Oriane Szekelyhidi

Office Manager

Oriane joins MDA after working with Dr. Peters for several years on both administrative and patient-related projects. She brings an incredible dual skill set to our office, with know-how and a truly caring touch.


Leah Toppel Nelson MMS, PA-C

Leah Toppel Nelson MMS, PA-C

Physician Assistant

Leah is a board certified physician assistant practicing in Chicago since 2009. Leah grew up in Madison, WI and remained in Madison to earn a BA in Spanish from the University of Wisconsin. After relocating to Chicago, she attended PA school, graduating as class president from J.H. Stroger, Jr. Hospital of Cook County/Malcolm X College. She joins us with five years of dermatology experience with special interests in acne, eczema and psoriasis treatment, as well as skin cancer prevention and surveillance. 

Prior to joining the Medical Dermatology Associates staff, Leah worked with closely with Dr. Neill Peters at Michigan Avenue Internists and Dr. Peter Lio at Dermatology & Aesthetics of Wicker Park.  Through her training with both Dr. Peters and Dr. Lio Leah is able treat a broad spectrum of skin conditions, both pediatric and adult.

Leah is very passionate about volunteer work in the community and has previously donated her time at Community Health Center in Chicago's West Town neighborhood, where she saw dermatology patients. In 2014 her volunteer work took her abroad, and she spent a month in Bolivia working with patients at a free clinic in the rain forest.

Leah's memberships include the American Academy of Physicians Assistant's (AAPA) and the Illinois Society of Dermatology Physician Assistants (ISDPA).

Leah's years of experience in Dermatology and personalized approach to patient care make her an exceptional addition to the MDA team.


Ally Johnson, LE

Ally Johnson, LE

Aesthetician

Ally is a graduate of Pivot Point International and has over 15 years of experience as a licensed aesthetician. In 2011, she became a licensed Aesthetics Instructor for the University of Aesthetics in Chicago. She holds an undergraduate degree in Liberal Arts from Columbia College Chicago.

Prior to MDA, Ally spent several years as a medical aesthetician and clinic manager. She is certified in several modalities including microdermabrasion and aesthetic laser treatments. At MDA, Ally works closely with her patients and our dermatologists to formulate customized treatment plans based on each patient’s personal goals. Her special interests include adult acne, anti-aging, and clinical skin care regimens.