Walter Liszewski is an Associate Professor of Dermatology and Cancer Epidemiology at Northwestern University in Chicago. He runs one of the busiest patch testing clinics in the country where he tests over 50 patients per month. Dr. Liszewski has served on the board of the American Contact Dermatitis Society, and he has published over 80 peer-reviewed papers. At Northwestern, he serves as the clinic practice director, runs numerous clinical trials, and he has specialty clinics in atopic dermatitis, chronic urticaria, and men's health.