Lady Cosgrove was appointed a Judge of the Supreme Court in 1996. She is the first woman to hold the appointment.
Lady Cosgrove is a graduate of Glasgow University (LLB) and was admitted to the Faculty of Advocates1 in 1968. She was Standing Junior Counsel2 to the Department of Trade from 1977 to 1979 and served as a Sheriff in Glasgow (1979-83) and Edinburgh (1983-96). She was appointed Queen's Counsel in 1991 and served as a Temporary Judge from 1992 until 1996.
From 1988 to 1991 she was a member of the Parole Board and from 1991 to 1996 she was Chairman of the Mental Welfare Commission. She was also Chairman of the Expert Panel on Sex Offending.