Gelotologist

However there are moral ramifications upon which a mere gelotologist, or student of laughter, would not be prepared to pass judgment.

Source: wiktionary

Fry, who calls himself a gelotologist (from the Greek root gelos, meaning laughter), says laughter defuses anger, lifts depression, increases alertness, enhances learning, promotes creativity and cooperation, fosters mental health […]

Source: wiktionary

A Stanford University professor and well-known Gelotologist has written that, "Besides increasing heart rate and hormone production, laughter moves extra nutrients and oxygen into your body's tissues."

Source: wiktionary