A founding member of the Ealing Film Studios repertory company, he gained wide popularity in their string of bright British comedies and was particularly appealing as the shy inventor in Alexander Mackendrick's "The Man in the White Suit" (1951). He secured an Oscar nomination as Best Actor in "The Lavender Hill Mob" (1951) but also excelled in dramatic portrayals, earning a Best Actor Academy Award for his thoughtful rendering of an English soldier bureaucrat in David Lean's "The Bridge on the River Kwai" (1957). His love for Joyce Carey's ribald novel "The Horse's Mouth" led him to adapt it for the screen in 1959, a labor which earned him an Academy Award nomination for the only screenplay he would ever write. The film also afforded him an outrageous turn as its monstrously comic painter Gully Jimson. That same year, Queen Elizabeth II also knighted him for his achievements on stage and screen.

Guinness resisted any temptation to move to Hollywood, preferring instead his native England where he often appeared on stage between movies. He tackled a variety of modern parts in addition to much of the Shakespeare canon and, though rarely treading the boards in the USA, did win a Tony Award for portraying Dylan Thomas in "Dylan" (1964). Success was his own worst enemy, and the decade following Lean's "Dr. Zhivago" (1965) was his most lackluster as he suffered through a spate of poor films and showy parts (i.e., "Cromwell" 1970, in which our sympathies wrongly go to his Charles I). He rebounded as the wise Obi-Wan Kenobi in George Lucas' "Star Wars" (1977), receiving an Oscar nomination as Best Supporting Actor (and 2-1/4 percent of the films profits). "Star Wars" introduced him to a new generation of moviegoers and his line "May the force be with you" found its way into the popular lexicon.

Guinness scored his greatest television success in 1979 when he created the role of veteran spy George Smiley in John LeCarre's "Tinker, Tailor, Soldier, Spy" (aired in the USA on PBS' "Great Performances" in 1980) which he later reprised in "Smiley's People" (1982). Returning full circle to his cinematic beginnings with "Little Dorrit", an adaptation from Dickens, he earned yet another Oscar nomination as Best Supporting Actor in the role of William Dorrit, the title character's imprisoned father.

Although not retired from acting, he has worked less frequently in the 1990s, concentrating much of his time on his memoirs, published in two volumes, "Blessings in Disguise" (1985) and "My Name Escapes Me" (1997).