Dr. Zaiac is recognized as an expert in skin cancer detection, Mohs surgery, and diagnosing conditions of the skin. Currently Chief, Department of Dermatology, at Mount Sinai Medical Center, he is dedicated to healing skin pathologies but also involved in the medical community, pursuing other appointments, including Professor and Chairman of Dermatology at the Herbert Wertheim College of Medicine at Florida International University. In 1991, Dr. Zaiac co-founded the Greater Miami Skin and Laser Center.

Dr. Zaiac is internationally recognized for his research and routinely featured as an expert on news programs and major publications including Elle Espanol, Ocean Drive Magazine, and the Miami Herald. He has authored dozens of articles and numerous book chapters in dermatology and dermatological surgical peer-reviewed publications. He is board certified from the American Board of Dermatology and the American Society of Mohs Surgery and a Board Member of the Foundation for International Dermatological Education.