Problem: Dafydd Rhys "Dave" Williams OC (born May 16, 1954) is a Canadian physician, public speaker and a retired CSA astronaut. Williams was a mission specialist on two space shuttle missions. His first spaceflight, STS-90 in 1998, was a 16-day mission aboard Space Shuttle Columbia dedicated to neuroscience research. His second flight, STS-118 in August 2007, was flown by Space Shuttle Endeavour to the International Space Station.

In January 1995, Williams was selected to join the 1995 international class of NASA mission specialist astronaut candidates. He reported to the Johnson Space Center in March 1995 and completed training and evaluation in May 1996. On completing basic training, he was assigned to work technical issues for the payloads/habitability branch of the astronaut office.  From July 1998 to November 2002, Williams served as Director of the Space and Life Sciences directorate with responsibility for research in both physical and biomedical space sciences at the Johnson Space Center (JSC). With this appointment, he became the first non-American to hold a senior management position within NASA. Overall crew medical safety was one of his principal concerns, in addition to flight medical operations and JSC occupational and environmental health. His programs were directed toward protecting astronauts from the hazards of the space environment, including space radiation and microgravity, in addition to maintaining their medical, physical, and psychological well-being while aloft and on return to Earth. His other oversight responsibilities were in the fields of telemedicine, 3-D tissue culture/regeneration in microgravity, the curatorial management of extraterrestrial materials, and of qualifying humans for very long space journeys and ensuring their safe return to Earth.  Williams served as an aquanaut on the first NEEMO (NASA Extreme Environment Mission Operations) crew aboard the Aquarius underwater laboratory in October 2001. During this mission, he was thrilled to shake hands underwater with Canadian underwater explorer Joe MacInnis. Williams was originally scheduled to command NEEMO 7 in October 2004, but was replaced by back-up crewmember and fellow CSA astronaut Robert Thirsk due to Williams undergoing review of a temporary medical issue. In April 2006, Williams commanded the NEEMO 9 mission. During this eighteen-day mission, the six-person crew developed lunar surface exploration procedures and telemedical technology applications.

What caused him to join NASA?

Answer with quotes: In January 1995, Williams was selected to join the 1995 international class of NASA mission specialist astronaut candidates.

Background: Mark Romanek (born September 18, 1959) is an American filmmaker whose directing work includes feature films, television, music videos and commercials. Romanek wrote and directed the 2002 film One Hour Photo and directed the 2010 film Never Let Me Go. His most notable music videos include "Hurt" (Johnny Cash), "Closer" (Nine Inch Nails), "Can't Stop" (Red Hot Chili Peppers), "Bedtime Story" (Madonna), "Scream" (Michael & Janet Jackson), and "Shake It Off" (Taylor Swift).
Context: Romanek was born in Chicago, Illinois, the son of Shirlee and Marvin Romanek. He is Jewish. He credits seeing Stanley Kubrick's 2001: A Space Odyssey at the age of nine which inspiring him to become a film director. He experimented with Super 8 and 16mm film as a teenager while attending New Trier High School. There, he studied first with Kevin Dole, a local filmmaker who was already creating a form of music video on his own in the mid-1970s, and then with Peter Kingsbury, a filmmaker who had studied with experimentalists Owen Land, John Luther Schofill, and Stan Brakhage at the School of the Art Institute of Chicago. Both teachers exposed students to works by significant figures of the American avant-garde cinema, such as Maya Deren, Kenneth Anger, and Paul Sharits.  Romanek subsequently attended Ithaca College in Ithaca, New York, and graduated from its Roy H. Park School of Communications with a degree in cinema and photography. He served as second assistant director for Brian De Palma on Home Movies, an autobiographical film De Palma conceived as an exercise for his students at Sarah Lawrence College (having returned to his alma mater as an instructor of film production). On set, Romanek met Keith Gordon, playing De Palma's alter ego. Gordon remembers Romanek's entrance into film production:  Romanek released his first film, Static, in 1986. It was co-written with Gordon and starred Gordon as a man who claimed he had invented a television set capable of showing a live picture of Heaven. The film achieved something of a cult following in London and led to Romanek's first job at the helm of a music video for the British new wave group The The, who featured on the soundtrack for Static, in 1986.
Question: When did Mark first get into film?
Answer: He experimented with Super 8 and 16mm film as a teenager while attending New Trier High School.

Question:
Petty was born October 20, 1950, in Gainesville, Florida, the first of two sons of Kitty (nee Avery), a local tax office worker, and Earl Petty, who worked in a grocery store. He had a brother, Bruce, who was seven years younger. His interest in rock and roll music began at age ten when he met Elvis Presley. In the summer of 1961, his uncle was working on the set of Presley's film Follow That Dream, in nearby Ocala, and invited Petty to watch the shoot.
Petty's first appearance in film took place in 1978, when he had a cameo in FM. He later had a small part in 1987's Made in Heaven and appeared in several episodes of It's Garry Shandling's Show between 1987 and 1990, playing himself as one of Garry Shandling's neighbors. Petty was also featured in Shandling's other show, The Larry Sanders Show, as one of the Story within a story final guests. In the episode, Petty gets bumped from the show and nearly comes to blows with Greg Kinnear.  Petty appeared in the 1997 film The Postman, directed by and starring Kevin Costner, as the Bridge City Mayor (from the dialogue it is implied that he is playing a future history version of himself). In 2002, he appeared on The Simpsons in the episode "How I Spent My Strummer Vacation", along with Mick Jagger, Keith Richards, Lenny Kravitz, Elvis Costello, and Brian Setzer. In it, Petty spoofed himself as a tutor to Homer Simpson on the art of lyric writing, composing a brief song about a drunk girl driving down the road while concerned with the state of public schools. Later in the episode, he loses a toe during a riot.  Petty had a recurring role as the voice of Elroy "Lucky" Kleinschmidt in the animated comedy series King of the Hill from 2004 to 2009. In 2010, Petty made a five-second cameo appearance with comedian Andy Samberg in a musical video titled "Great Day" featured on the bonus DVD as part of The Lonely Island's new album Turtleneck & Chain.
Answer this question using a quote from the text above:

What was his character in FM

Answer:
a cameo