Rennie was born in Bradford, Yorkshire, England, and had several other jobs before gaining employment as a stand-in in a Censored page film of 1936. Acting then became his profession, but it was some years before he found success as a leading man in the cinema, his exceptional height and chiselled features standing him in good stead. In 1945, he played a major role in the original version of The Wicked Lady, starring Margaret Lockwood and James Mason. From that point on, he was a star, and shortly afterwards he moved to the USA, where he appeared in such classics as
In 1959, Rennie became a familiar face on television, taking the role of Harry Lime in The Third Man, a spin-off series from the film starring Orson Welles. During the 1960's he continued his TV career with guest appearances on such series as Lost In Space and Batman. Returning to the UK, he died in 1971 at Harrogate in his home county of Yorkshire from emphysema.
- The IMDb entry on Rennie