Since 1993, the majority of de Segonzac's work has been on television in law enforcement-themed dramas such as ', "Oz", "Brooklyn South", "Law & Order", ', and "". He also worked for Michael Moore's Emmy-winning "TV Nation", and provided director and cinematographer duties for a number of made-for-television movies. With Barry Levinson, he is credited with having created the "loose, free-flowing visual style" of "Homicide: Life on the Street" "that built on the documentary-style affectations of "Hill Street Blues"." Critic Matt Zoller Seitz, writing for Salon.com, called it one of the 10 greatest television pilots of all time. In 2000, de Segonzac directed actress Adrienne Shelly in the "Law & Order" episode "High & Low". Shelly was murdered on November 1, 2006. In February 2007, de Segonzac directed the "Law & Order" episode "Melting Pot", which was a thinly veiled version of the Shelly murder.