Thomas turned professional in 1949, taking up a position as an assistant. He later played tournament golf, and won more than a dozen titles in Britain and around Europe. He also tried his hand in the United States with less success, although he did win a qualifying tournament for the U.S. Open in 1964 and finished second in the St. Paul Open.[1]
In 1958, Thomas finished tied with Peter Thomson after 72 holes in the Open at Royal Lytham, but lost the 36-hole Saturday playoff by four strokes. At Muirfield in 1966, he again finished as runner-up, one stroke behind Jack Nicklaus. Throughout his career, Thomas was renowned for his long, straight, driving, and once hit a drive during a practice round for the 1967 Open at Hoylake onto the green at the 420-yard (384 m) second hole.[1]
Thomas represented Great Britain in the Ryder Cup on four occasions, in 1959, 1963, 1965 and 1967, only being defeated once in his five singles matches. He also represented Wales in the Canada Cup, which later became the World Cup of Golf, on eleven occasions,[1] and again at the Double Diamond Internationals in 1972.
Thomas was elected Captain of the Professional Golfers' Association during their centenary year in 2001, and in 2006 was recognised for his contribution to golf by being made an honorary life member of the PGA.[2]
After retiring from tournament golf due to back and eye problems,[1] Thomas set up a golf course design business.[3] He designed over 100 courses around the world,[4] and his work includes Hacienda Del Alamo, the Brabazon, Derby and PGA National courses at Ryder Cup venue The Belfry.[2][5][6]
Thomas lived his last few years in Marbella, Spain where he died at his home on 27 August 2013.[7]