Answer by taking a quote from the following article:

William Henry Beveridge, 1st Baron Beveridge, KCB (5 March 1879 - 16 March 1963) was a British economist who was a noted progressive and social reformer. He is best known for his 1942 report Social Insurance and Allied Services (known as the Beveridge Report) which served as the basis for the post-World War II welfare state put in place by the Labour government elected in 1945. He was considered an authority on unemployment insurance from early in his career, served under Winston Churchill on the Board of Trade as Director of the newly created labour exchanges and later as Permanent Secretary of the Ministry of Food. He was Director of the London School of Economics and Political Science from 1919 until 1937, when he was elected Master of University College, Oxford.

Later in 1944, Beveridge, who had recently joined the Liberal Party, was elected to the House of Commons in a by-election to succeed George Charles Grey, who had died on the battlefield in Normandy, France, on the first day of Operation Bluecoat on 30 July 1944. Beveridge briefly served as Member of Parliament (MP) for the constituency of Berwick-upon-Tweed, during which time he was prominent in the Radical Action group, which called for the party to withdraw from the war-time electoral pact and adopt more radical policies. However, he lost his seat at the 1945 general election, when he was defeated by the Conservative candidate, Robert Thorp, by a majority of 1,962 votes. The following year, the new Labour Government began the process of implementing Beveridge's proposals that provided the basis of the modern Welfare State. Clement Attlee and the Labour Party defeated Winston Churchill's Conservative Party at the 1945 general election. Attlee announced he would introduce the Welfare State outlined in the 1942 Beveridge Report. This included the establishment of a National Health Service in 1948 with taxpayer funded medical treatment for all. A national system of benefits was also introduced to provide "social security" so that the population would be protected from the "cradle to the grave". The new system was partly built upon the National Insurance scheme set up by Liberal Prime Minister, David Lloyd George in 1911. In 1946, Beveridge was elevated to the House of Lords as Baron Beveridge, of Tuggal in the County of Northumberland, and eventually became leader of the Liberal Party in the House of Lords. He was the author of Power and Influence (1953). He was the President of the charity Attend (then the National Association of Leagues of Hospital Friends) from 1952-1962.

Did he hold any job other than the house of commons?
Beveridge briefly served as Member of Parliament (MP) for the constituency of Berwick-upon-Tweed,