- Had wanted to be a real police officer and attended the L.A. Police Academy.
- Attended Juilliard at the same time that Homicide: Life on the Street (1993) co-star Andre Braugher attended. He was a freshman when Braugher was a senior. Braugher played Iago in a performance of "Othello," and Diamond played one of his servants.
- Plays guitar in the rock band "Chuck Valiant". His wife, Marnie McPhail is the lead singer.
- His mother Allison is an astrologer and lives in Malvern, Pennsylvania.
- The family summered in Ocean City, New Jersey, and lived there for a year when Reed was 7.
- Attended Trinity School, NYC
- His father, Bob Diamond, directed The Joe Franklin Show (1950), and later was director of supernumeraries and children with the Metropolitan Opera in New York City.
- Ex-son-in-law of Stephen F. Kesten.
- Series regular in Designated Survivor (2016) and his costar, Brian Howe from Journeyman (2007) was a guest star in 2017.
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