Meet the Doctors

Meet Our Doctors

Click on a staff member's name to view their bio.

Back row:James Russell, M.D. | Kathleen S. Stokes, M.D. | Bradley Straka, M.D. |Steven Schuckit M.D. |Glenn Sondag, M.D. | Front row: Kristina Kleven, M.D. |Thomas J. Russell, M.D. | Sun Young "Sunny" Ruggeri, M.D. | Gretchen Zirbel, M.D. Not Pictured: Matthew Fleming, M.D. | Courtney Papp, PA-C


Dr Thomas Russell

Thomas Russell, M.D.

Dr. Russell founded the dermatology practice in 1973; the practice became Affiliated Dermatologists, S.C. in 1981. He has been recognized by Milwaukee Magazine's "Top Docs" in four consecutive surveys and by Best Doctors in America. Dr. Russell is affiliated with Froedtert Memorial Lutheran Hospital, the VA Hospital, St. Luke's Medical Center, Columbia St. Mary's and Elmbrook Memorial Hospitals. He is Board Certified in Dermatology.

Dr. Russell is a Clinical Professor at the Medical College of Wisconsin (MCW) and has received teaching awards from MCW and the Dermatology Foundation, a national educational organization. Among his professional activities are numerous leadership positions with organizations including the Wisconsin Dermatological Society, Milwaukee Academy of Medicine, American Academy of Dermatology and Noah Worcester Dermatological Society.

He served as the dermatologist and allergist at Barksdale Air Force Base, Shreveport, Louisiana, after completing his residency in dermatology at the Mayo Clinic. He earned his medical degree from the Marquette University School of Medicine and served his internship at Minneapolis General Hospital (now Hennepin County General Hospital). His bachelor's degrees in chemistry and philosophy are also from Marquette University.

Dr. Russell has four adult children, including James P. Russell, M.D., who joined the practice in 2005. His personal interests include photography, traveling and family history.

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Dr Glenn Sondag

Glenn Sondag, M.D.

Dr. Sondag retired as of October 2014

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Dr Kathleen Stokes

Kathleen S. Stokes, M.D.

Named three times as one of Milwaukee Magazine's "Top Docs" and every year since 1996 named in Who's Who in American Medicine, Dr. Stokes is recognized as one of southeast Wisconsin's most outstanding dermatologists.  She has practiced with Affiliated Dermatologists, S.C. since 1991.

In addition to her practice, she is an Associate Clinical Professor of Dermatology at the Medical College of Wisconsin.  She has presented on a wide range of dermatological topics. Dr. Stokes travelled to Shanghai China in 2006 and 2010, presenting on Dermatology and Systemic Disease as well as Cosmetic Dermatology.  Most recently, in 2013, she presented in Arizona for the 47th Annual Clinical Conference for the Medical College of Wisconsin.

Dr. Stokes is affiliated with Froedert Hospital, Elmbrook Hospital, the VA Hospital and St Luke's Medical Center.  She is certified as a Diplomate of the American Board of Dermatology. She has held leadership roles with the Wisconsin Dermatological Society,  the Medical College of Wisconsin Alumni Board, and the Dermatology Foundation.  In addition, she is a member of the American Academy of Dermatology, The American Medical Association, the Milwaukee Academy of Medicine, TEMPO, and the Alpha Omega Alpha Honor Society in Medicine.

Dr. Stokes completed her dermatology residency at the Medical College of Wisconsin (MCW).  She served as chief resident in Dermatology in 1990-91.  Her medical degree is from MCW and her Master's degree and bachelor's (magna cum laude) degrees from the University of Utah.  Her interests in Dermatology include diagnosis and treatment of melanoma and skin cancer, and cosmetic dermatology.

Dr. Stokes is married and has three sons.  She enjoys dance, travel and skiing.

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Dr Gretchen Zirbel

Gretchen Zirbel, M.D.

Dr. Zirbel joined Affiliated Dermatologists, S.C. in 1994. In addition to general dermatology, she contributes her expertise in pediatrics to the practice. She is an Assistant Clinical Professor at the Medical College of Wisconsin (MCW) and a Guest Lecturer at Marquette University. She is affiliated with Froedtert Memorial Lutheran Hospital, the VA Hospital, Elmbrook Memorial Hospital and St. Luke's Medical Center.

She is certified as a Diplomate of the American Board of Dermatology and a Diplomate of the National Board of Medical Examiners. She is a member of local, state and national professional organizations. Her research publications and presentations reflect her interest in pediatric dermatology. She has also practiced in Kenya and Hondures in volunteer positions.

Dr. Zirbel became Chief Resident, Dermatology, at MCW in 1993, the third year of her residency. She served her Medical/Pediatric internship at Grady Hospital of Emory University, where she received her medical degree, magna cum laude. Prior to becoming a physician, Dr. Zirbel earned was a Physicians' Assistant working in cardiothoracic surgery.

She is a cellist and performs with the concord chamber orchestra, as well as playing piano and harp.

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Dr Bradley Straka

Bradley Straka, M.D.

Recognized by Milwaukee Magazine's "Top Docs" as an "up and comer," Dr. Straka is building a reputation for his astute diagnostic skills, with expertise in complex contact dermatitis. He is known for his enthusiasm and ebullient personality. The partners of Affiliated Dermatologists, S.C. brought him into the practice in 2002, immediately following his residency at the Medical College of Wisconsin (MCW). Dr. Straka is Board Certified in Dermatology.

Dr. Straka is a member of several professional organizations and he is also the team dermatologist for the Milwaukee Brewers.

He rose to Chief Resident, Dermatology, at MCW. He served his internship in Transitional Medicine at St. Luke's Medical Center. His medical degree, with honors, is from the University of Illinois, where he was first in his class and was inducted into the Alpha Omega Alpha Honor Society. His Bachelor of Science degree in Biology is from the University of Illinois.

Dr. Straka has two sons. He is an avid antique collector, painter, and equestrian.

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Dr Kristina Kleven

Kristina Kleven, M.D.

The practice welcomed Dr. Kleven in 2005. Board Certified in Dermatology, she is committed to the care of patients of all ages with a variety of skin conditions. In addition, she brings special interest and expertise in the special dermatologic needs of children and adolescents and surgical dermatology.

She is an Assistant Clinical Professor at the Medical College of Wisconsin (MCW), and she has published a number of dermatology studies. Dr. Kleven is active in several local and state organizations.

Dr. Kleven was Chief Resident in Dermatology at MCW and completed her internship at St. Luke's Medical Center. She attended MCW where she earned numerous accolades, including induction into the Alpha Omega Alpha Honor Society and the AOA Service Project Award. Dr. Kleven served as director of the Isaac Coggs Free Clinic in Milwaukee and received the Clinical Excellence Award.

She is married and enjoys spending time with her three young daughters. She also enjoys painting in acrylics and oils.

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Dr James Russell

James Russell, M.D.

After serving as Chief Resident in the Mayo Clinic Department of Dermatology, Dr. Russell joined his father at Affiliated Dermatologists, S.C. in 2005. Board Certified in Dermatology, he is committed to the philosophy that the patient comes first, and he tries to embody that commitment with each individual patient. He is an active endurance athlete, and although he enjoys treating patients with a wide variety of skin conditions, Dr. Russell has a special interest in dermatological aspects of sports medicine and active lifestyles.

While training at the Mayo Clinic, Dr. Russell received the O'Leary Award for Clinical Excellence and the Roy S. Rogers Award for Excellence in Patient Care. He has published several dermatological studies and is an Assistant Clinical Professor at the Medical College of Wisconsin.

Dr. Russell has a number of active hobbies including triathlons, road and mountain biking, cross country and downhill skiing, running and traveling. Dr. Russell is married and has two children. He also enjoys playing the guitar and singing in an acoustic band, Rimbender.

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Dr Sun Young Ruggeri

Sun Young "Sunny" Ruggeri, M.D.

Dr. Ruggeri is a Board Certified in Dermatologist who treats a range of skin disorders from kids to geriatric patients.

She focuses primarily on medical dermatology but also has significant training in pediatric dermatology and cutaneous surgery.

Dr. Ruggeri graduated from medical school at Baylor College of Medicine in Houston, Texas, and completed her residency in dermatology at the Medical College of Wisconsin in 2007 where she is an Assistant Clinical Professor.

Dr. Ruggeri and her physician husband have two young children.

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Dr Steven Schuckit

Steven Schuckit M.D.

Dr. Steven Schuckit earned his medical degree from the Medical College of Wisconsin where he was inducted into Alpha Omega Alpha Honor Society. Serving as Chief Resident in dermatology, he completed his residency at the University of Michigan in 2014.

He is well versed in treating patients of all ages and complexities. During his residency at the University of Michigan, Dr. Schuckit received special training in melanoma, cutaneous lymphoma, and immunobullous disorders. He is a member of the American Academy of Dermatology, the American Medical Association and American Society of Dermatologic Surgery. He is interested in global health and has participated in missions on three different continents.

Dr. Schuckit is a Milwaukee native who enjoys spending time with his wife and young daughter. He is an avid guitar player and was a member of a successful band while in college. His other interests include photography, reading, technology, and travel.

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Dr Matthew Fleming

Matthew Fleming, M.D.

Dr. Matthew Fleming attended medical school, and completed his internship and dermatology residency in 1986 at SUNY Downstate, Brooklyn NY and his dermatopathology fellowship at the Cleveland Clinic in 1988. He was full-time faculty at Rush-Presbyterian-St. Luke’s Medical Center from 1988-1994 and the Medical College of Wisconsin from 1995-2009. He directed dermatopathology labs at both institutions and was also director of MCW’s immunodermatology lab for several years. In 2009 Dr. Fleming left MCW to start a private dermatopathology laboratory. In addition to directing the laboratory, Dr. Fleming entered dermatology practice in Menomonee Falls.

Dr. Fleming is board-certified in both dermatology and dermatopathology. He practices general dermatology but has special expertise in cases that require clinicopathologic correlation. He also is particularly interested in following patients at increased risk of developing melanoma, because of abnormal moles, family history, or previous melanoma.

Dr. Fleming is married and has two daughters. His personal interests include exercising, reading, and developing medical software.

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Dr Courtney Papp

Courtney Papp, PA-C

Courtney Papp received her Master's of Medical Science degree from the Physician Assistant program at Midwestern University in Downers Grove, Illinois in 2003. Prior to beginning her education as a Physician Assistant, she received an undergraduate degree in biology from the University of Dayton in Dayton, Ohio.

She began her medical career working in internal medicine; however, she then chose to work in the specialty of dermatology. Before joining Affiliated Dermatologists, S.C., Courtney worked for a dermatology practice in La Grange, Illinois for four years.

She has also received recognition as a Diplomate from the Society of Dermatology Physician Assistants, given after completing a specialty certification on dermatology.

Her areas of interest include acne, atopic dermatitis, psoriasis and skin cancer screenings.

Courtney is married and has one child.

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