Worked as a radio announcer while in college
Film acting debut, "Rogue River"
First starring role in a film, "Red Planet Mars"
Had a memorable supporting role as a German spy in Billy Wilder's "Stalag 17"
Played a father on the run from the law in Charles Laughton's "The Night of the Hunter"
Debut as a TV series regular, played the rancher and adoptive single father in NBC's Western series, "Fury" (retitled Brave Stallion in syndication runs)
Starred in the syndicated Australia adventure series, "Whiplash," as a pioneering stage coach company owner
Co-starred as Maj. Frank Whittaker in "Court-Martial," the pilot for a military legal series (aired as two episodes of NBC's "Kraft Suspense Theater")
Reprised role as Maj. Frank Whittaker in "Court-Martial," a mid-season replacement series on ABC
Joined the cast of the popular espionage series "Mission: Impossible" (CBS) during its second season as special agent Jim Phelps; earned Golden Globe (1969, 1970) and Emmy (1969) nominations for Best Actor
Starred as Jim Kingsley in "Call to Danger," the initially unaired pilot for "Mission: Impossible," which aired as part of the summer replacement series "Premiere"
Reprised the role of Jim Phelps in the feature "Mission: Impossible vs. the Mob"
Hosted and narrated "Strange Places," a syndicated documentary series
Starred as Douglas Warfield, an undercover federal agent, in the CBS TV-movie pilot, "Call to Danger"
Miscast as private eye Lew Archer in the pilot, "The Underground Man" (Brian Keith as cast in the subsequent series)
Starred in the ABC TV-movie, "Dead Man on the Run," as a special government agent
Appeared as Major Noah Cooper, commander of the Fighting 69th squadron, in the NBC TV series "Buck Rogers in the 25th Century"
Starred as Captain Oveur in the hit feature comedy, "Airplane!"
Reprised the role of Captain Oveur for "Airplane II: The Sequel"
Appeared as Palmer Kirby in the ABC blockbuster miniseries, "The Winds of War"
Reprised the role of Palmer Kirby for the ABC sequel miniseries, "War and Remembrance"
Reprised the role of Jim Phelps for the ABC revival of "Mission: Impossible"
Hosted "Discover: The World of Science," a series of documentary specials on PBS
Hosted the revival of "Biography," a documentary profile series on A&E
Narrated the documentary feature, "The Rise & Fall of the Soviet Union"
Hosted the NBC documentary special, "The Unexplained: Witches, Werewolves & Vampires... Are They Real?"
Provided the voices of General Sherman and General McClellan for "Smithsonian's Great Battles of the Civil War," a miniseries on The Learning Channel
Had a recurring role as Colonel John Camden on the WB series, "7th Heaven"
Parodied his Biography work in the film "Men in Black II," hosting an exposé television show
Received a star on the Hollywood Walk of Fame