(written from a Production point of view)
Jeff Witzke (born 1 April 1970; age 51) is an actor who appeared as an operations officer in several episodes of Star Trek: Voyager. He received no credit for his appearances but is listed on the call sheets.
Witzke has started his career in the early 1990s and appeared in several projects directed by Jason Reitman. Besides Voyager, he was also featured in episodes of All That (1994), Almost Perfect (1996, with David Clennon and Eileen Seeley), and Tracey Takes On... (1999, with Seymour Cassel) and lent his voice to the short comedy H@ (1999, along with Jim O'Heir).
Further film work includes the music drama Groove (2000), the short comedies In God We Trust (2000, with Jim O'Heir) and Queen for a Day (2000, with Jolene Blalock), the short film Gulp (2001), the short comedy Consent (2004), the drama Thank You for Smoking (2005, with Terry James, Aaron Lustig, Spencer Garrett, Earl Billings, Tom Miller, and Bruce French), the television comedy Mindy and Brenda (2006), the short drama The Drifter (2007), the short comedy Dan Mog: An Old Dog Learns a New Trick (2007), the drama Juno (2007, with Rainn Wilson), the short film Bench (2007), the romance Up in the Air (2009), the drama Reconciliation (2009), the comedy Vampires Suck (2010, with Diedrich Bader), the short drama The Perfect Gentleman (2010), the thriller The Visitation (2010, with Michael Bailey Smith), the comedy Losing Control (2011, with John Billingsley, Barry Gordon, Jamison Yang, and Sumalee Montano), the comedy sequel Beverly Hills Chihuahua 3: Viva La Fiesta! (2012, with Jason Brooks, Miguel Ferrer, and Phil LaMarr), the comedy The Guilt Trip (2012, with Robert Curtis Brown, Tom Virtue, Jeff Kober, Brett Cullen, Adam Scott, and Danny Pudi), the thriller Labor Day (2013, with Marva Hicks), the television drama A Country Christmas Story (2013), the drama Men, Women & Children (2014, with Phil LaMarr), the crime drama Money Monster (2016), the television drama All the Way (2016, with Frank Langella, Stephen Root, Ray Wise, Ken Jenkins, Aisha Hinds, Spencer Garrett, Randy Oglesby, Hal Landon, Jr., Dan Desmond, Stoney Westmoreland, Regi Davis, Kevin Brief, Kerry Hoyt, Dan Sachoff, Dale E. Turner, Clint Lilley, Kitty DeCarlo, and Ethan Phillips and executive produced and written by Robert Schenkkan), the action drama Shangri-La Suite (2016, with John Carroll Lynch, Paul Rae, Brad Greenquist, and Robert Gatewood), the television comedy Casting Call (2017, with John Rosenfeld), the comedy The Brownlist (2018), the drama The Front Runner (2018, with Spencer Garrett andd Joe Chrest), and the drama Vice (2018, with Alison Pill, Don McManus, Shea Whigham, Tyler Perry, Scott Alan Smith, Omid Zader, Mark Bramhall, Tyson Weihe, and Time Winters).
Television roles in the 2000's include episodes of Malibu, CA (2000, with Tom Virtue), 7th Heaven (2000, with Stephen Collins, Catherine Hicks, Michael Canavan, Christopher Michael, and Brenda Strong), The King of Queens (2001, with Merrin Dungey), Kate Brasher (2001, with K Callan, Robert Costanzo, and David Selburg), Sabrina the Teenage Witch (2001, with D. Elliot Woods), Monk (2003, with Stanley Kamel), Rock Me, Baby (2003, with John Eric Bentley), Drake & Josh (2004), Scrubs (2004, with Ken Jenkins), Passions (2004, with Leigh Taylor-Young and McKenzie Westmore), Will & Grace (2005), Twins (2005, with Eve Brenner), Four Kings (2006, with Patrick Fischler, Todd Stashwick, John Harnagel, and Tom Virtue), The War at Home (2006, with Todd Stashwick), The O.C. (2005-2006, with Melinda Clarke, Alan Dale, William O. Campbell, Autumn Reeser, and Mark Daniel Cade), Help Me Help You (2007, with Brenda Strong and Seth MacFarlane), The Office (2007, with Rainn Wilson), The Closer (2007, with Raymond Cruz, Scott Alan Smith, and Jeff Austin), NCIS: Naval Criminal Investigative Service (2008), Family Guy (2008, with Seth MacFarlane and Kevin Michael Richardson), Trust Me (2009, with Greg Ellis, Bob Morrisey, Tim Russ, and Adam Scott), Nip/Tuck (2009), The Mentalist (2009, with Jane Daly, Raphael Sbarge, and Gregory Itzin), Greek (2010), Til Death... (2010, with Lori Lively), The New Adventures of Old Christine (2010), Perfect Couples (2011), Workaholics (2011), Fletcher Drive (2012), Bones (2005 and 2012, with Bonita Friedericy), Wedding Band (2012, with Bill Blair), Poop Notice (2013), Rizzoli & Isles (2014, with Bruce McGill, Merrin Dungey, and Lisa Kaminir), The Goldbergs (2015, with Billy Malone and Antal Kalik), Faking It (2015, with Bruce Thomas, Rebecca McFarland, and Dan Gauthier), Reasonably Decent (2015, written by, produced, and starring Lidia Sabljic), Monster Shrink (2015), The Big Bang Theory (2015, with Wil Wheaton), Bella and the Bulldogs (2016), Pitch (2016), American Housewife (2016, with Diedrich Bader), Kings of Con (2016, with Kim Rhodes), The Mick (2017, with Corey Mendell Parker), Henry Danger (2017), Clarence (2017), Disjointed (2017), Days of Our Lives (2017, with John Aniston), and Ghosted (2017, with Adam Scott).
In 2012 he wrote, executive produced, and starred in the television comedy House Husbands (2012, with Ken Jenkins and Kelli Kirkland). Between 2016 and 2017, Witzke worked as writer, producer, and actor on all eight episodes of the comedy series ShowFriends on which Ren Hanami and Kelli Kirkland guest-starred. He also produced the short drama Stay. (2020). He has also been working as acting coach for John Rosenfeld Studios in Los Angeles, California. 
More recently, Witzke appeared in episodes of Runaways (2018, with Annie Wersching, Brigid Brannagh, Marlene Forte, and James Marsters), Superstore (2019), Jane the Virgin (2019), and Solve: The Podcast (2020) and lent his voice to the video game Final Fantasy XV: Episode Ardyn (2019, along with John DeMita, John Kassir, and Keythe Farley) and the drama The Big Ugly (2020, with Malcolm McDowell, Ron Perlman, Bruce McGill, and Richard Ortega-Miro).