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Michael O'Neill began his acting career under the mentorship of Will Geer, and his daughter Ellen, at the Theatricum Botanicum in Los Angeles. A native of Alabama, O'Neill has a degree in Economics from Auburn University and was the University's Fall 2019 Commencement Speaker. He was also the 2018 commencement speaker at the University of Montevallo in Alabama.

Michael has served on the Board of the Hollywood Branch of the Screen Actors Guild and has often participated in the SAG-AFTRA Foundation's BookPALS program, reading to elementary school children. He has also been involved in Teach for America, Habitat for Humanity, and Focus on Recovery in Birmingham.

He can currently be seen as "Victor" in Netflix's new hit limited series, ECHOES and just completed production on the short film, BOUND, which he is also co-producing.

O'Neill's recent credits include "Larry Mills" in the NBC drama series, COUNCIL OF DADS, "Chaplain Kendricks" in the critically acclaimed feature film, CLEMENCY (which won the Sundance Film Festival Grand Jury Prize), "Senator Mitchell Chapin" in Season 2 of TOM CLANCY'S JACK RYAN on Amazon and "Dell Connelly" in the film, THE STAND AT PAXTON COUNTY on Netflix.

In addition, Michael won a Best Actor award at the Idyllwild International Festival of Cinema for the short film, COLD CALL.

Other appearances include THIS IS US, NCIS: LOS ANGELES, 11.22.63, SHOOTER, S.W.A.T. and a five episode arc in the final season of SCANDAL. Previous television credits include his four season role on the award winning Sundance TV series, RECTIFY, the CBS series, EXTANT with Halle Berry and A&E's BATES MOTEL.

O'Neill's memorable TV roles include GREY'S ANATOMY and fan favorite "Special Agent Ron Butterfield" on THE WEST WING, as well as VEGAS, NCIS, SONS OF ANARCHY and THE UNIT.

In feature films, Michael played FDA Agent "Richard Barkley" in the award winning DALLAS BUYERS CLUB and his vast credits include INDIVISIBLE, J. EDGAR, GREEN ZONE, TRANSFORMERS, SECONDHAND LIONS, TRAFFIC, SEA OF LOVE and SEABISCUIT.

He is married to Mary O'Keefe O'Neill and they have three world class daughters, Ella, Annie and Molly.