Early Life and Education
Siegel grew up in Minneapolis with a deep interest in science fiction and monster movies, including the Famous Monsters of Filmland magazine.1 He earned a degree in Theatre from the University of Minnesota.1
Following his university studies, Siegel attended Ringling Bros. and Barnum & Bailey Clown College, where he studied under Verne Langdon, a makeup and prosthetics instructor who had worked on the original Planet of the Apes (1968).1 Langdon's curriculum covered character development, clown makeup, and foundational prosthetics techniques. Siegel earned a spot in the touring show.1
Career
After Clown College, Siegel worked at the Universal Studios Tour attraction "Land of a Thousand Faces" for approximately three and a half years.1 The show, conceived by Verne Langdon, involved live monster makeup demonstrations for park visitors. During this period Siegel developed hands-on skills in sculpting, mold-making, and prosthetic makeup effects.
From there he moved into film production effects work, building credits across several notable productions through the late 1970s and 1980s:41
- Star Trek: The Motion Picture (1979): sculpted Klingon foreheads
- Star Wars: Episode V - The Empire Strikes Back (1980): model shop and creature shop work
- Dune (1984): fabricated stillsuits in foam alongside colleague Bill Bryan (see Ghostbusters section below)
- Star Wars: Episode VI - Return of the Jedi (1983): model shop and creature shop work
- Ghostbusters (1984): see section below
- The Goonies (1985)
- Big Trouble in Little China (1986)
- The Blob (1988)
In 1988, Siegel relocated to the San Francisco Bay Area and was hired at Lucasfilm's Industrial Light and Magic.1 He worked in the ILM Model Shop as a sculptor, creature-maker, and puppeteer for 14 years, then transitioned into Computer Graphics (CG), continuing as a character and creature modeler for roughly another 12 years before retiring from the industry in 2016.1
Notable ILM-era credits include:4
- Ghostbusters II (1989): see section below
- Terminator 2: Judgment Day (1991): sculpted T-1000 metallic prototype elements
- Jurassic Park (1993)
- Star Wars: Episode I - The Phantom Menace (1999): sculpted eopie maquette
- A.I. Artificial Intelligence (2001)
- Star Wars: Episode II - Attack of the Clones (2002)
- Star Wars: Episode III - Revenge of the Sith (2005)
One of Siegel's hands appears on a United States postage stamp, photographed while he was sculpting a maquette of E.T. for the film's 20th-anniversary release. The image was featured on the "American Filmmaking: Behind the Scenes" commemorative stamp series issued by the U.S. Postal Service on February 25, 2003.4
Ghostbusters
Ghostbusters (1984)
Siegel's connection to Ghostbusters pre-dates the production itself. While working on David Lynch's Dune, he collaborated with fellow effects artist Bill Bryan on the fabrication of stillsuits from foam.2 Bryan subsequently landed a role on the Ghostbusters crew, in part because of that shared work.2 Siegel himself joined the effects unit handling Slimer.
For the original film, Siegel sculpted Slimer's teeth, tongue, inner mouth, and the complete replacement puppet head (a second head with a different mouth expression).3 During principal photography and effects work, he also puppeteered Slimer's tongue and eyebrows for the majority of shots.3 Siegel's contributions to Ghostbusters (1984) went uncredited on screen.1
His photo work from the production appears in The Complete SFX Guide to Ghostbusters (2014 and 2016 editions), which credits him with behind-the-scenes images from the shoot.2
Ghostbusters II (1989)
For the sequel, Siegel was hired by ILM specifically to resculpt and rebuild Slimer, whose tone shifted to something lighter and more cartoonish than the original.3 He focused on Slimer's head, body, and face, while Howie Weed handled the arms and hands for the full-sized puppet.3 The two worked under the ILM Sculpture and Prosthetics department, led by Mike Smithson, for which Siegel received an on-screen credit as Sculptor.5
One significant technical challenge involved the transition from the original Ghostbusters puppet, whose jaw had been controlled manually, to the sequel's servo-operated animatronic system.3 The manually controlled original allowed for more chaotic, exaggerated jaw movements; the servo system offered greater precision but reduced the range of spontaneous motion.3
A production emergency arose late in shooting when ILM visual effects supervisor Dennis Muren observed that the puppet's spandex bean-bag body would not photograph correctly.3 Siegel had to mix and apply large batches of foam latex over the entire body in less than one day, a rushed fix that further reduced the suit's flexibility.3
Personal Life
Siegel is retired and lives in the San Francisco Bay Area. Since leaving the industry in 2016, he has shared his knowledge of practical and digital effects work through interviews, podcasts, talks at schools, and volunteer work for the Walt Disney Family Museum.1
References
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The Companion, "CGI Fridays: How 'Monster Kid' Mark Siegel Made it at ILM," thecompanion.app, https://www.thecompanion.app/cgi-friday-mark-siegel-ilm/
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The Complete SFX Guide to Ghostbusters (2014 and 2016 editions). Via Spook Central, https://www.spookcentral.tk/. Photo credits (Mark Siegel, 1984) and Bill Bryan/Dune stillsuit reference. Mark Bryan Wilson: "Steve sculpted the full skins, and Mark Siegel also helped sculpt." Sculptor Bill Bryan: "responsible for the Destructor, having won the job after making the stillsuits for David Lynch's Dune out of foam with his colleague Mark Siegel."
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ILM, "Pushing the Limits with Slimer for Ghostbusters 2," ilm.com, https://www.ilm.com/ghostbusters-2-ilm-slimer/
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"Mark Siegel (nm0796878)," IMDb, https://www.imdb.com/name/nm0796878/; biography at https://www.imdb.com/name/nm0796878/bio/ (accessed 2026-06-13). Stamp detail: "The Special Effects stamp features Mark's hand sculpting a maquette of E.T." on the 10-stamp sheet of 37-cent commemoratives issued February 25, 2003.
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Spook Central, "Ghostbusters II Screen Credits," https://www.spookcentral.tk/sclib/ghostbusters-ii-screen-credits, transcribing Ghostbusters II (Columbia Pictures, 1989) on-screen ILM credits. Credit reads: "Lead Sculpture & Prosthetics -- Mike Smithson / Sculptors -- Mark Siegel."
