<P> Huertas's acting career started in 1993 when he played an uncredited part in The Webbers . </P> <P> In 1998, Huertas portrayed Joe Negroni in the romantic drama Why Do Fools Fall in Love alongside such stars as Halle Berry, Paul Mazursky, and Ben Vereen . In 1999, he appeared in two films: the horror movie Cold Hearts and the action movie Stealth Fighter . In the 2000s, he appeared in many films, but his biggest role was in television in 2008 as Sergeant Espera in HBO's miniseries Generation Kill about the 2003 invasion of Iraq . </P> <P> From 1998 to 1999, Huertas played the role of Antonio in the television series Moesha . From 1999 to 2000, he played Brad, a witch hunter, in Sabrina, the Teenage Witch . Beginning in 2009, Huertas has starred in the role of Detective Esposito in ABC's police procedural Castle . In 2012, Huertas and his Castle co-star Stana Katic received the award for Performance in a Drama Episode at the 16th Annual PRISM Awards . </P> <P> Huertas was elected to serve a one - year term, beginning September 25, 2010, as an alternate member of the National Board of Directors and as a member of the Hollywood Division Board of Directors of the Screen Actors Guild . </P>

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