Patrick Fischler (born 29 December 1969; age 55) is the actor who portrayed Mercer in the Star Trek: Enterprise fourth season episode "Demons".
Born in Los Angeles, California, Fischler is founder and co-artistic director of the Los Angeles based theater group "Neurotic Young Urbanites". He has starred in many stage plays and has directed several musicals.
Among his acting resume are films such as Speed (1994, with Joe Morton, Alan Ruck, Richard Lineback, Carlos Carrasco, Jordan Lund, Bruce Wright, Robin McKee, Mike Fujimoto and stunts by Jophery C. Brown, Janet Brady, Gary Epper, Tom Huff, Eddie Mathews, Patricia Tallman, Scott Wilder, Chuck Hicks and Jimmy Ortega), Twister (1996, with Alan Ruck, Zach Grenier, Richard Lineback, Bruce Wright and stunts by Tommy J. Huff and Mic Rodgers), Mulholland Drive (2001, with Michael John Anderson, Wayne Grace, Blake Lindsley, Robin Ritter, Geno Silva and stunts by Brian Avery, Joni Avery and Denney Pierce), Old School (2003, with Harve Presnell), Win a Date with Tad Hamilton! (2004), The Black Dahlia (2006), and Garden Party (2007).
His resume also includes guest appearances in television series such as The Adventures of Brisco County, Jr. (1993), NYPD Blue (1996 & 2001, starring Gordon Clapp and Sharon Lawrence), Charmed (2002, with Shannon O'Hurley and John Thaddeus), Birds of Prey (2003, with Dina Meyer and Ian Abercrombie), Angel (2003), ER (2004, with Scott Grimes, Paul Dooley and Michelle C. Bonilla), The West Wing (2004, starring Martin Sheen, with Gary Cole and Ron Canada), According to Jim (2007), and a recurring role in Nash Bridges (1996-2001).
Fischler later had recurring roles as Jimmy Barrett in the second season of Mad Men (2008, alongside Mark Moses, Denise Crosby, Christopher Jude, Donald Sage Mackay, Arlo Hemphill, Melinda Page Hamilton, Tom Ormeny and Deborah Lacey) and as Phil in J.J. Abrams' and Damon Lindelof's Lost (2009, starring Naveen Andrews, Daniel Dae Kim and Terry O'Quinn). He had guest roles in NCIS (2008), Burn Notice (2008), Cold Case (2008, with William Dennis Hunt and Erin Cummings), and Pushing Daisies (2008, with Stephen Root), and featured roles in Miss Nobody (2009, with Richard Riehle) and in Southland (2009, with Michael McGrady and Brian Brophy). Fischler had his first video game role in 2011 in L.A. Noire, which also featured Keith Szarabajka.