New name. Same great care.

Jason G. Whalen, MD

Gretchen Kreizenbeck, MD

Katie O’Brien, MPAS, PA-C

Rachel Limpert, CRNP


COVID-19 UPDATE: 8/16/2021
All patients must wear masks to their appointment, regardless if vaccinated or not.

We are pleased to announce that, in accordance with state and local guidelines, we are currently offering in-office appointments for both emergent and non-emergent visits. We do, however, continue to recommend the use of our TELEDERMATOLOGY (virtual visits) when appropriate and possible for our patients. This option allows our patients to receive the care they need without coming into the office. If you are interested in this option, we encourage you to call the office to inquire about scheduling.

Whalen Dermatology provides medical and cosmetic care to patients of all skin types, ages, ethnicities and conditions. We serve the greater Pittsburgh area with state-of-the-art equipment and technologies. A patient-centered approach helps us to provide the most comprehensive care plans and quality treatments for common and uncommon skin conditions. We look forward to caring for you and your family at your next visit.


Jason Whalen, MD

Jason G. Whalen, MD

Dr. Whalen is a board certified dermatologist who has practiced in Pittsburgh for over 14 years. He is a Fellow in the American Academy of Dermatology and is on staff at St. Clair Hospital.

Dr. Whalen received a Bachelor of Science degree from Pennsylvania State University in 1995 where he graduated Phi Beta Kappa with distinction. He graduated in 2002 from the University of Pittsburgh School of Medicine, Cum Laude, and was elected to Alpha Omega Alpha, the national medical honor society. Dr Whalen fulfilled his one year internship at Mercy Hospital in the Internal Medicine Department.

He completed his residency at The University of Pittsburgh Medical Center where he served as Chief Resident in Dermatology and was an Assistant Course Director for second year medical students. While in residence, Dr. Whalen’s research was published in many dermatology journals. Dr. Whalen lives in the South Hills with his wife, Elaine, and their 2 daughters.

Gretchen Kreizenbeck, MD

Gretchen Kreizenbeck, MD

Dr. Kreizenbeck is a board certified dermatologist who has practiced in Pittsburgh for over 6 years. She is a member of the American Academy of Dermatology and Women’s Dermatologic Society.

Dr. Kreizenbeck is from Deadwood, South Dakota. She graduated summa cum laude with a B.S. in Biochemistry in 2003 and received both the Merck Index and Student Leadership awards from the University of Notre Dame.

While a medical student at the Yale University School of Medicine, Dr. Kreizenbeck completed her thesis in the field of melanoma. After accepting the Max Kade Clinical Clerkship, she studied in Salzburg, Austria and graduated in 2007 as a Yale Farr Scholar. She completed her internship at the Yale Primary Care Program and completed her residency in dermatology with the Yale Dermatology Residency Program in 2011.

Her specialties include adult and pediatric medical dermatology (including acne, eczema, psoriasis, hair loss, and skin cancer screening and treatment), surgical excisions; and cosmetic procedures including Botox, fillers, and laser therapy. She lives in Upper St. Clair with her husband, 2 young children, and 2 “dog-like” cats.

Katie O'Brien, MPAS, PA-C

Katie O'Brien, MPAS, PA-C

Katie O’Brien, MPAS, PA-C is a certified Physician Assistant who has been specializing in dermatology for the past 8 years.

Born in Pittsburgh, PA, Katie received her Bachelor of Science degree from The Pennsylvania State University in 2009 and went on to obtain her Masters of Physician Assistant Studies from Shenandoah University in Winchester, VA.

Katie is a member of the American Academy of Physician Assistants, The Pennsylvania Society of Physician Assistants, and the Society of Dermatology Physician Assistants.

When she is not working, Katie enjoys spending time with her family. She lives in South Hills with her husband, two sons, one daughter, and Boxer dog.

Rachel Limpert, CRNP

Rachel Limpert, CRNP

Rachel Limpert, CRNP, is a certified family nurse practitioner who has been working in dermatology for over three years.
Born in southern New Jersey, Rachel received her undergraduate Bachelors of Science in Nursing degree from The Pennsylvania State University. Upon graduation, she returned home and worked for several years as a registered nurse in various fields including medical/surgical, trauma, as well as pre and post anesthesia care. She also continued her education at Rowan University in Glassboro, NJ where she went on to obtain her Master of Science in Nursing as a Family Nurse Practitioner with honors. 
Rachel has been living in the South Hills with her husband since 2017. When not working, she enjoys spending time with family and friends, her chocolate Labrador dog, and vacationing back home to the Jersey shore. 


160 Millers Run Rd.
Suite 500
Bridgeville, PA 15017
Fax: 412.564.5478




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