Dr. Patrick Lillis was the first dermatologist in the Loveland area. He started his practice in Loveland in 1979, making it one of the longest-lasting dermatology practices in the region. A dermatology pioneer, Dr. Lillis was one of the first doctors in Northern Colorado trained in using Mohs Surgery to treat skin cancer.
Dr. Joseph V. Lillis is a board certified dermatologist offering expertise in all areas of dermatology including skin cancer surveillance, skin cancer surgery and medical dermatology. A graduate of Georgetown University Medical School, Dr. Lillis did his dermatology training at Oregon Health Sciences University in Portland, Oregon where he served as chief resident during his final year. 
Sarah M. Bair M.D. joined the practice at Lake Loveland Dermatology in February 2012. Dr. Bair is a Fellow of the American Academy of Dermatology (FAAD) and specializes in both cosmetic and clinical dermatology. She brings her youthful, female perspective to the growing practice at Lake Loveland Dermatology and to Northern Colorado.
Matthew J. Mahlberg, M.D. is a board-certified dermatologist and fellowship-trained dermatologic surgeon who specializes in Mohs micrographic surgery for skin cancer, laser surgery, and aesthetic dermatology. He currently serves as President-Elect of the Colorado Dermatologic Society.
David J. Seitz is a board certified Physician Assistant and has Diplomate Status with the Society of Dermatology Physician Assistants. He attended Western Illinois University and Colorado State University for his undergraduate and pre-medical studies. For his medical school training, David attended Midwestern University in Chicago and participated in the student chapter of the Christian Medical and Dental Association.
Sheena E. Chand is a board certified Physician Assistant and Masters of Medical Science. She attended Colorado State University for her undergraduate degree in biology and Northeastern University Masters degree.
Kathryn L. Olsen, PA-C has joined the team at Lake Loveland Dermatology, the oldest dermatology practice in Loveland. Olsen previously worked in Loveland in a family practice for seven and a half years.
