He is an expert on the topic of medical and recreational cannabis, and also has a strong interest in the areas of physician health, addiction and recovery, and in psychedelic treatments.

[1] His subsequent book, Seeing Through the Smoke: A Cannabis Expert Untangles the Truth About Marijuana, features a foreward written by Dr. Andrew Weil.

He was featured on NPR's All Things Considered in a piece about the harmfulness of withholding medication assisted treatment for opioid use disorders from physicians.

[9] Grinspoon graduated from Swarthmore College with Honors in Philosophy and then went to work for Greenpeace for five years before enrolling in medical school.

At Greenpeace, he wrote an influential piece in The Nation titled, "Atom and Eve: A Love Story" based on leaked documents from the nuclear industry.