Malcolm Bruce is one of the longest serving members of the Liberal Democrats, having held his seat since 1983.
Malcolm Bruce was made a privy councillor in 2006
In Lib Dem terms he is viewed as a moderate, although he was a strong opponent of the defunct "project" to bring the party and Labour together.
The MP for Gordon is currently the president of the Scottish Lib Dems.
He stood for the leadership of the party when Paddy Ashdown stepped down in 1999 and came third.
Born on 7 November, 1944 Mr Bruce joined the Liberals at the age of 17.
He fought his first election in 1974 but did not enter parliament until 1983 when he won the Gordon seat with a majority of 850.
He was leader of the Scottish Social and Liberal Democrats in 1988-89, Scottish Lib Dem leader from 1989-92 .
He has become known for his expertise on the issue of North Sea oil and his support for devolution.
Mr Bruce has sat on the Scottish Affairs, trade and industry and standards and privileges select committees.
At Westminster he is chairman of the International Development Select Committee and has held a number of high profile party spokesman roles, including trade and industry, environment, food and rural affairs and treasury.
Mr Bruce is vice president of the National Deaf Children's Society and has learned sign language.
He was made a privy councillor in 2006 by invitation of Her Majesty the Queen.