Deklin was born in Pittsburgh, Pennsylvania. He graduated from Thomas Jefferson High School in 1986. He holds a B.A. in English and History from the Pennsylvania State University, an M.F.A. in acting from the University of Washington in Seattle, and is a certified member of the Society of American Fight Directors.
A classically trained stage actor, Deklin has made many appearances on Broadway, Off-Broadway and at regional theaters. On television, he had recurring roles as Dr. Matthew Shaw in the Fox series Justice from 2006 to 2007, as Elliott Mayer in the CBS sitcom The Ex List in 2008, and as Stan Edwards in the CBS drama Hawaii Five-O from 2011 to 2012. He also had voice roles in the several video games, like Call of Duty 3, Metal Gear Solid: Peace Walker, and God of War: Ghost of Sparta, and co-starred in the films Riverworld, The Wish List, The Wedding Chapel, and Mini's First Time.
Deklin starred in two short-lived series, the Fox primetime drama Lone Star as Trammell Thatcher in 2010, and in the ABC soapy comedy GCB, as Blake Reilly in 2012. He also has number of guest-starring roles in television series, including Sex and the City, Charmed, Frasier, CSI: Crime Scene Investigation, Desperate Housewives, Nip/Tuck, Two and a Half Men, The Mentalist, Hot in Cleveland and Hawaii Five-0. In 2014. Deklin was cast in the series regular role of Nicholas Deering in the Lifetime comedy-drama Devious Maids.
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