Education
Sinclair studied at Queen"s University, Belfast before working as a surgeon.
Sinclair studied at Queen"s University, Belfast before working as a surgeon.
He was elected to the Senate of Northern Ireland on its creation in 1921. He was elected as a Ulster Unionist Party Member of Parliament (Member of Parliament) for Queen"s University of Belfast at the 1923 United Kingdom general election. From 1935 to 1937, Sinclair served as Deputy Speaker of the Senate of Northern Ireland.
He resigned his Westminster seat on 18 September 1940 by appointment as Steward of the Chiltern Hundreds. but held his Senate seat until his death in November.
33rd United Kingdom Parliament. 34th United Kingdom Parliament. 35th United Kingdom Parliament.
36th United Kingdom Parliament.
37th United Kingdom Parliament.