Cat Stevens is the former stage name of Steven Demetre Georgiou (born in London on 21 July 1948). He is a British singer-songwriter, multi-instrumentalist, humanitarian and education philanthropist. In December 1977, Stevens converted to Islam and adopted the name Yusuf Islam the following year. He began releasing music as Yusuf in 2006. Stevens' albums Tea for the Tillerman (1970) and Teaser and the Firecat (1971) were both certified triple platinum in the US by the RIAA. His 1972 album Catch Bull at Four sold half a million copies in the first two weeks of release alone and was Billboard's number-one LP for three consecutive weeks.