Dennis Boutsikaris (/ˌbuːtsɪˈkærɪs/; born December 21, 1952) is an American character actor who has won the Obie Award twice.

[3] A graduate of Hampshire College in Amherst, Massachusetts, Boutsikaris toured the country with John Houseman's The Acting Company doing classical theatre.

His more recent films include Cherry Crush, The Education of Charlie Banks, Calling It Quits, and Money Monster.

He has also had recurring roles on Sidney Lumet's 100 Centre Street, Nurse, Trinity, ER, Law & Order and Showtime's Shameless.

[11] In 2017–2018 Boutsikaris played a recurring role as Malcolm Croft, a professor at MIT and Liam's mentor in CBS's Salvation.

[13] On Broadway Boutsikaris became the first American to play Mozart in Amadeus, and was directed by Laurence Olivier in Filumena.

At the Geffen Theatre in Los Angeles he appeared in the premiere of David Mamet's The Old Neighborhood and in 2007 Jane Anderson's The Quality of Life with Laurie Metcalf and Jo Beth Williams.