Andrew Sinclair, FRSL FRSA, was Director of Historical Studies, Churchill College, Cambridge, 1961-1963; and Lecturer in American History, University College London (UCL), 1965-1967.

Andrew Sinclair was also involved in the world of cinema and among his notable achievements was his screenplay to the highly under-rated movie Before Winter Comes (directed by J. Lee Thompson [1914-2002], Columbia Pictures, 1968; based on the 1966 novel by Frederick L. Keefe, The Interpreter).

Despite all of his notable and distinguished credentials, Andrew Sinclair inspired the birth of the modern pseudo-histories of Rosslyn Chapel and the discovery of America by “Prince” Henry Sinclair (“leader of the Knights Templar”) – developing the earlier pseudo-historical claims of Frederick J. Pohl (1889-1991).

The Prince Henry Sinclair Society of North America believe he landed at Chedabucto Bay, Nova Scotia in 1398. The monument to the expedition was erected on 17 November, 1996 (there is also an old legend, that the Welsh prince Madoc discovered America in 1170).

Andrew Sinclair was conferred Honorary Knight of the Rank of Knight Grand Cross Prince at Rosslyn Chapel, in December 2004.