Hailing from Colorado, Brian Dietzen made his big-screen debut alongside Kelly Clarkson and Justin Guarini in From Justin to Kelly (2003) . He graduated with a BFA, majoring in acting, the University of Colorado at Boulder. He performed with the Colorado Shakespeare Festival for two years and spent five years performing contemporary theatrical works like "Equus" and "Same Time, Next Year" honoring him with the UROP grant for Outstanding Achievement in the Creative Arts.　　Recently, Brian moved to L.A. where he was cast in the WB series "My Guide to Becoming a Rock Star" (2002) as a regular. Also, in L.A., he starred with Steve Rudnick in a two-man theatre production of "The Oldest Man in Show Biz" at the Hudson Stage, winning critical acclaim

2003年，在爱情歌舞喜剧片《热舞狂潮》中，与凯莉·克莱森和JustinGuarini一起首次亮相大荧幕。

2004年，在CBS的罪案剧《海军罪案调查处第一季》中，出演首席法医官Donald“Ducky”Mallard的助手JimmyPalmer。第六季开始，由循环演员晋升为联合演员，从第十季起晋升为常规演员。