(written from a Production point of view)
During his time on Star Trek, he earned four Emmy Award nominations and two wins for Outstanding Achievement in Special Visual Effects for the following episodes:
- 1990 Emmy Award nomination for the episode "Tin Man", shared with Robert Legato, Gary Hutzel, Steve Price, Erik Nash, Don Lee, and Michael Okuda
- 1991 Emmy Award nomination for the episode "The Best of Both Worlds", shared with Gary Hutzel, Robert Legato, David Takemura, Michael Okuda, Erik Nash, Steve Price, Syd Dutton, Robert Stromberg, Bill Taylor, and Don Lee
- 1995 Emmy Award for the episode "Caretaker", shared with Dan Curry, David Stipes, Michaek Backauskas, Joe Bauer, Edward L. Williams, Scott Rader, Adam Howard, Don Lee, Robert Stromberg, John F.K. Parenteau, Joshua D. Rose, and Joshua Cushner
- 1999 Emmy Award nomination for the episode "Timeless", shared with Mitch Suskin, Arthur J. Codron, Eric Chauvin, Rob Bonchune, John Allardice, Gregory Rainoff, Ron Thornton, John Teska, Dan Curry, and Sherry Hitch
- 1999 Emmy Award nomination for the episode "What You Leave Behind", shared with Dan Curry, Gary Hutzel, David Stipes, Adam Buckner, Arthur J. Codron, Judy Elkins, Gary Monak, Paul Maples, Steve Fong, Paul Hill, Davy Nethercutt, Kevin Bouchez, Gregory Rainoff, Adam Howard, Larry Younger, Sherry Hitch, Rob Bonchune, and David Lombardi
- 1999 Emmy Award for the episode "Dark Frontier", shared with Dan Curry, Ronald B. Moore, Mitch Suskin, Elizabeth Castro, Arthur J. Codron, Paul Hill, Gregory Rainoff, Rob Bonchune, Adam Lebowitz, and John Teska
In addition, Greenberg won an International Monitor Award in 1998 for Film Originated Television Series - Electronic Visual Effects for the episode "Call to Arms" which he shared with David Stipes, Dan Curry, Adam Buckner, Steve Fong, Kevin Bouchez, and Davy Nethercutt.
Beside his work on Star Trek, he won an Emmy Award in 2000 for Outstanding Special Visual Effects for a Series for The X-Files episode "First Person Shooter", shared with Bill Millar, Deena Burkett, Jeff Zaman, and Steven J. Scott and received nominations in 2000 for The X-Files episode "Rush", shared with Bill Millar and Deena Burkett, and in 2004 for the Angels in America episode "Perestroika", shared with Stefano Trivelli, Lawrence Littleton, Michele Moen, and Gregory Jein.
Throughout his career as visual and digital effects compositor, Greenberg has worked for companies such as Digital Magic, R!ot, Pacific Title, SPI, Rhythm & Hues, and Hydraulx on projects including the television series Freddy's Nightmares (1989), Dark Shadows (1991), Lois & Clark: The New Adventures of Superman, Legend (1995), Dark Skies (1996), VR.5 (1995-1997), The X-Files (1998-2000), Dark Angel (2000), The Tick (2001-2002), and Smallville (2001-2002).
Greenberg's film credits include the television movie Knight Rider 2000 (1991, with David E. Duncan), the science fiction sequel Philadelphia Experiment II (1993, with Janet Muswell and Adam Howard), the television movie Alien Nation: Dark Horizon (1994, with Adam Howard, Stephen Lebed, Bill Millar, and Jeff Zaman), the comedy Money Talks (1997), the fantasy comedy Monkeybone (2001), the science fiction film The One (2001), the horror film Queen of the Damned (2002), the fantasy films The Scorpion King (2002) and The League of Extraordinary Gentlemen (2003), Quentin Tarantino's crime thriller Kill Bill: Vol. 1 (2003), the comic adaptations Spider-Man 2 (2004), Catwoman (2004), Fantastic Four (2005), X-Men: The Last Stand (2006), 4: Rise of the Silver Surfer (2007), and X-Men Origins: Wolverine (2009), Steven Spielberg's science fiction remake War of the Worlds (2005), the science fiction sequel AVPR: Aliens vs Predator - Requiem (2007), the mystery film The X Files: I Want to Believe (2008), the action drama 2012 (2009), the remake The A-Team (2010), and the science fiction thriller Skyline (2010).
Star Trek episodes
(This list is currently incomplete.)
- "Tin Man" - Lead Compositor (uncredited, Season 3)
- "The Best of Both Worlds" - Lead Compositor (uncredited)
- "Liaisons" - Lead Compositor (uncredited, Season 7)
- "Gambit, Part I" - Lead Compositor (uncredited)
- "Phantasms" - Lead Compositor (uncredited)
- "Attached" - Lead Compositor (uncredited)
- "Inheritance" - Lead Compositor (uncredited)
- "The Pegasus" - Lead Compositor (uncredited)
- "Sub Rosa" - Lead Compositor (uncredited)
- "Thine Own Self" - Lead Compositor (uncredited)
- "Eye of the Beholder" - Lead Compositor (uncredited)
- "Journey's End" - Lead Compositor (uncredited)
- "Bloodlines" - Lead Compositor (uncredited)
- "Preemptive Strike" - Lead Compositor (uncredited)
- "All Good Things..." - Lead Compositor (uncredited)