Blocker began appearing on American television in 1974, acting in an episode of Marcus Welby, M.D. at the age of 16. He has had guest roles in ER; Little House on the Prairie; The X-Files; Beverly Hills, 90210; Walker, Texas Ranger; Night Court; Murder, She Wrote; M*A*S*H; Doogie Howser, M.D.; Matlock; Quantum Leap and CHiPs. At age 19, he was cast in the role of 1st Lt. Jerry Bragg on the military drama Baa Baa Black Sheep (1976–1978). He did not have another regular TV series role until being cast in Brooklyn Nine-Nine (2013–2021).
He played a one-shot supporting role in Bonanza: The Return as a reporter named Fenster, though not as the son of Hoss Cartwright, the role made iconic by his father.
An article published by NBC states that (at an unspecificed date) "Blocker went back to school to earn his bachelor of arts degree so he could teach K-12" and in 2017, published a book that he had written, Master and the Little Monk, about "a lonely young boy who is befriended by a unique ally and mentor".

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