Born Reuven Shraibman in Comrat in the Bessarabia Governorate of the Russian Empire (now in Moldova), Shari received a traditional Hebrew primary edu- cation, before attending high school in Chisināu. He later studied law at university and was amongst the founders of the Romanian branch of Tzeiri Zion. In 1925, he made aliyah to Mandatory Palestine, where he joined the Haganah. He served as secretary of the Kfar Saba Workers Council between 1930 and 1934, and later had spells as secretary of the workers councils of Rehovot (1934-1943) and Jerusalem (1943-1949). During the Siege of Jerusalem in 1948 he was a member of the Jerusalem Committee. In the same year he became a member of Jerusalem City Council, and served as Deputy Mayor until 1951. In the 1949 elections, Shari was elected to the Knesset on the Mapai list. At that time, he was a member of the party's central committee. On 2 April 1951, he became the country's first ever Deputy Minister, when he was appointed Deputy Minister of Transportation in the second government. He was re-elected in 1951, but lost his deputy post. In the 1955 elections he lost his Knesset seat. The following year he returned to Jerusalem City Council, but left it in 1958. From 1957 until 1968 he worked in the Ministry of Labour as head of Labour Relations. Shari also served as Israel's civil service commissioner.