Dan Dion is a photographer specializing in portraits, performing arts, and hospitality. He is internationally renowned as the world’s most prolific portrait photographer of comedians. He worked as the house photographer at the legendary Fillmore Auditorium in San Francisco for twenty years, as well as for many other venues, including The Warfield, The Paramount Theater, The Punch Line, and Cobb's Comedy Club.

His work has been published in hundreds of publications, including Time, Newsweek, Rolling Stone, Playboy, Spin, Entertainment Weekly, Esquire, and Variety. Album and DVD art has been commissioned by artists of stature such as George Carlin and Ramblin’ Jack Elliot.

Other clients include Pixar, Comedy Central, Warner Brothers, project (RED), Atlantic Records, T*Mobile, Rhino Records, Monster Cable, The Fairmont Hotels, and Anti-/Epitaph Records.

In May of 2010 his first book, ¡Satiristas! was published by HarperCollins to much critical acclaim. A collaboration with comic/filmmaker Paul Provenza, it features portraits and interviews. In 2014, he publishedTuesday Tucks Me In- a children's book about a wounded veteran and his service dog, which was voted by the editors at Amazon as the Best Children's Non-Fiction book of the year.

He has ongoing solo exhibitions of his work in New York, San Francisco, Portland, Hollywood, and Sydney,

In 2019, he moved to Nashville to become the head of A&R at 800 Pound Gorilla Records, the nation's biggest stand-up comedy label. In 2024, he left and founded his own label, Goat Song Records, with a roster that includes Patton Oswalt, Margaret Cho, Arj Barker, Jena Friedman, and Robert Hawkins.