Question: Who directed a 2000 animated short film that was produced by a visual effects company founded by George Lucas?
Context: Kenneth "Ken" Ralston (born 1954) is an American visual effects artist, currently the Visual Effect Supervisor and Creative Head at Sony Pictures Imageworks.  Ralston began his career at the seminal commercial animation and visual effects company, Cascade Pictures in Hollywood, where he worked on over 150 advertising campaigns in the early 1970s.  In 1976, he was hired at Industrial Light & Magic by Dennis Muren to help George Lucas create the effects for "Star Wars".  He remained in ILM for 20 years before joining Sony Pictures Imageworks as president.  Ralston is best known for his work in the films of Robert Zemeckis. Manex Visual Effects (MVFX) was a motion picture special visual effects company located in Alameda, California.  Though a small company active only for a short period of time, it provided visual effects for a number of high-profile movies and the company received international recognition including two Best Visual Effects Oscars and one Academy Award for Technical Achievement.  As the company that created Bullet time for The Matrix their work has been highly influential. Richard Bluff is an English special effects supervisor.  Known for his works in Disney's visual effects company Industrial Light & Magic (ILM) as a digital matte artist and visual effects supervisor in acclaimed films such as "" (2005), "The Island" (2005), "Transformers" (2007-11), "Indiana Jones and the Kingdom of the Crystal Skull" (2008), "Star Trek" (2009), "Avatar" (2009), "The Avengers" (2012), "Cloud Atlas" (2012) "Pacific Rim" (2013), "The Big Short" (2015) and "Doctor Strange" (2016), for which he received an Academy Award for Best Visual Effects nomination at the 89th Academy Awards.  He previously worked at Blur Studio as digital artist. Harrison Ellenshaw (born Peter Ellenshaw, July 20, 1945 in Harrisburg, Pennsylvania) is an American matte painter, following his British-born father Peter Ellenshaw.  He started his career at Walt Disney Studios.  He later joined George Lucas's effects studio Industrial Light and Magic (ILM), where he produced many of the matte visual effects backgrounds for the films "Star Wars" (1977) and "The Empire Strikes Back" (1980).  He then returned to Disney to work on the film "Dick Tracy" (1990), and eventually headed Disney Studio's effects department, Buena Vista Visual Effects (BVVE).  He was also visual effects supervisor for "Tron" (1982), where he had the distinction of being the first person to have that credit in a film. The AACTA Award for Best Visual Effects or Animation (previously Best Visual Effects) is an award presented by the Australian Academy of Cinema and Television Arts (AACTA) for achievements in visual effects in film, television, documentary and short film.  The award was first presented by the Australian Film Institute (AFI)at the Australian Film Institute Awards (known commonly as the AFI Awards) from 2006-2010, prior to the establishment of the Academy.  In 2014 the award for Best Visual Effects was renamed Best Visual Effects or Animation.  Additionally, this category is now open to any film, television or documentary production, regardless of geography, which has had 100% of its visual effects and animation made in Australia. Scanline VFX is a visual effects company with offices in Los Angeles, Vancouver and Munich.  The company is known for its proprietary, in-house fluid effects software Flowline, which is used in various fluid effects like water and fire.  Scanline was sole developer for Flowline, for which it received a 2008 Scientific and Technical Achievement Academy Award.  In 2008, the company was nominated for an Academy Award for Best Achievement in Visual Effects for its work on director Clint Eastwood's "Hereafter", for which it was the sole visual effects vendor.  The company works mainly in feature films and TV movies, and offers VFX, 3D animated features and post-production services. Atmosphere Visual Effects is a Canadian visual effects company.  It was founded in Vancouver in 2003 by Andrew Karr, Tom Archer, and Jeremy Hoey, ex-employees of Vancouver-based visual effects company GVFX, after said company folded in that year.  They have worked on a number of science fiction shows, including the reimagined "Battlestar Galactica", "Stargate Atlantis", "The 4400", "Andromeda", and "". Vision Crew Unlimited (VCU) was a motion picture and TV commercial visual effects company founded in 1994 by visual effects artists Evan Jacobs, Jon Warren and Douglas Miller.  The company later expanded into a full service visual effects firm. Industrial Light & Magic (ILM) is an American motion picture visual effects company that was founded in May 1975 by George Lucas.  It is a division of the film production company, Lucasfilm, which Lucas founded, and was created when Lucas began production of the film "Star Wars".  It is also the original founder company of the animation studio Pixar. Work in Progress is a 2000 ILM computer animated short film directed by Tom Bertino
Answer: Tom Bertino