(written from a Production point of view)
Roberts worked as assistant editor in the 1970s on projects such as the comedy The Steagle (1971), the documentary Jimi Hendrix (1973), the comedy Freebie and the Bean (1974), the drama Sparkle (1976), and the comedy The Gumball Rally (1976). He then started to work as editor in the late 1970s and worked prior to his time on Star Trek: The Next Generation on the action comedy Greased Lightning (1977), the crime drama Straight Time (1978), the drama Players (1979, music by Jerry Goldsmith), the drama A Small Circle of Friends (1980), an episode of Hostages (1981, with assistant editor Michael Backauskas), the drama One from the Heart (1982), the drama Hammett (1982), the thriller Jaws 3-D (1983), the television drama Kids Don't Tell (1985), and the television series Alfred Hitchcock Presents (1985-1986).
Further editorial credits include L.A. Law (1991-1994), Chicago Hope (1994-1996), Early Edition (1996), The $treet (2000), The Agency (2001), and the 2002 television drama Dead in a Heartbeat.
Between 1986 and 1999 Roberts worked as director and directed episodes of Alfred Hitchcock Presents (1986, with Bruce Gray, Sam Hennings, and Nana Visitor), Hard Copy (1987, with Erich Anderson and Fionnula Flanagan), Miami Vice (1988, with Barry Lynch), Dirty Dozen: The Series (1988), Hunter (1989, with Tim de Zarn, Sam Hennings, and Christopher Carroll), Gideon Oliver (1989, with Sam Hennings and Joel Polis), Tour of Duty (1987-1989, with Rosalind Chao, Lloyd Kino, and Dan Gauthier), Quantum Leap (1989, with Scott Bakula, Dean Stockwell, and Jill Jacobson), L.A. Law (1993 and 1994, with Corbin Bernsen and Larry Drake), Chicago Hope (1996, with Joel Polis, Dion Anderson, and Ellen Bry), and Early Edition (1999, with Molly Hagan and Kelly Connell).
In addition to his work as editor and director, Roberts was co-producer and supervising producer on the television series Early Edition and co-producer, producer, and supervising producer on the drama series Law & Order: Special Victims Unit (2001-2011).
In 1995 Roberts received an Emmy Award nomination for Outstanding Individual Achievement in Editing for a Series - Single Camera Production for his work on the Chicago Hope episode "The Quarantine". He also received an Eddie nomination from the American Cinema Editors for Best Edited One-Hour Series for Television for this episode. Other Eddie nominations include 1993 for the L.A. Law episode "Say Goodnight Gracie" and in 1998 for the Early Edition episode "The Wall Part I". He won an Eddie in 1997 for the Chicago Hope episode "Transplanted Affection". Today, Roberts is the president of the American Cinema Ediors.