(written from a Production point of view)
Neiman made his television debut in a 1998 episode of The X-Files directed by Kim Manners. The following year, he made an appearances on 3rd Rock from the Sun (with his "Inside Man" co-star, Richard McGonagle), UPN's G vs E (which starred Clayton Rohner), and J.J. Abrams's Felicity.
From 1999 through 2001, Neiman a recurring role as Attorney Barry Mathers on David E. Kelley's Ally McBeal. During his time on this show, Neiman worked with such performers as Albert Hall, Famke Janssen, Kevin Rahm, Jack Shearer and William Windom. Neiman also appeared in the first episode of David Kelley's 2000 series, Boston Public. In 2007, he appeared with Rene Auberjonois in Kelley's Boston Legal, which also starred William Shatner.
In addition, Neiman has been seen on shows such as The West Wing (in an episode with John Billingsley), Strong Medicine (which was developed by Whoopi Goldberg), Everwood (with Stephanie Niznik), JAG (again working with Richard McGonagle, in an episode also featuring Scott Lawrence, Zoe McLellan, William Sadler, Dean Stockwell, and Ray Wise), Six Feet Under (co-starring Abby Brammell, Joanna Cassidy, Rosalind Chao and James Cromwell), and Bryan Fuller's Pushing Daisies. He also had a two-episode recurring role on The Guardian (with Erich Anderson, Tracy Middendorf, Jeff Ricketts and Raphael Sbarge) and, in 2004, played the recurring role of Sigmund on the fantasy series Charmed (including an episode with Annie Wersching).
Neiman had roles in two films released in 1999: Enemy Action (co-starring Henry Darrow, Richard Lynch and Carel Struycken) and Restraining Order (with Ed McCready, Natalia Nogulich, Dean Stockwell and Spice Williams). He also had a role in the fifth Hellraiser film, Hellraiser: Inferno, which was released directly to home video in 2000. Michael Shamus Wiles appeared in this film, as well.
In 2002, Neiman was seen as Hogan's Heroes actor Robert Clary in the Bob Crane biographical drama Auto Focus, which co-starred Nikita Ager, Ed Begley, Jr., Michael McKean and Don McManus. He also appeared in the science fiction drama S1m0ne that same year, along with Winona Ryder. He later appeared in the 2005 remake of The Longest Yard (starring James Cromwell and Ed Lauter) and in Corbin Bernsen's 2005 comedy Carpool Guy.
In addition to his film and TV work, Neiman also lent his voice to two installments in the Lands of Lore video game series. The first was Lands of Lore: Guardians of Destiny in 1997, which also featured the voices of Clancy Brown, Sherman Howard, Julie Newmar and Vincent Schiavelli. The second, 1999's Lands of Lore III, also featured the voice of Clancy Brown, as well as Darleen Carr.