Keir O’Donnell is a Hollywood actor. His career started in the early 2000s. During his beginnings, he appeared in the television shows 8 Simple Rules, Lost, Killer Instinct, and The Closer, among others. His first notable role was as Todd in the movie Wedding Crashers. He followed this with appearances in the films The Break-Up, Flakes, and After Sex. He later appeared in the movies Paul Blart: Mall Cop and Taking Chances. He also appeared as a recurring character Lowell Harland, Jr. in Sons of Anarchy. He next joined the main cast of My Generation as Kenneth Finley. In the 2010s, he had recurring roles in United States of Tara and Fargo. During this period, he also made notable roles in the films Dawn of the Planet of the Apes, American Sniper, Incarnate, and Gifted.