As a leading authority in medicine, Les has spent the past 40 years innovating in his field. In his early career, Les held a position as an Emergency Room Physician for over a decade. In 1986 Les became the Director of Health Services at Cornell University followed by a role as Director of Student Health Services at UC Santa Cruz.

He graduated from the New York Downstate Medical School of Brooklyn and did his post-graduate training at UCSF in the early 1970s. He Co-founded White Bird Clinic in Oregon in 1975 providing free medical care and crisis intervention for the Eugene community.

He has been a long-time Cannabis advocate and spent two years as a physician on HelloMD providing medicinal cannabis guidance for patients seeking to improve their health and well-being.