Zander worked with the law firm of
Sullivan & Cromwell on Wall Street for a year before returning to the United Kingdom in 1959. He gave up his scholarship at Lincoln's Inn and became a solicitors’ articled clerk with
Ashurst Morris Crisp. He became a qualified solicitor in 1962. During his
clerkship he was legal adviser to
Tony Benn in his battle to
remain in the House of Commons. In 1963, Zander joined the
LSE Law Department. He was appointed to a Chair in 1977; he was Convenor (Dean) of the Law Department from 1984 to 1988 and again in 1997–98. He was appointed an Honorary
Queen's Counsel in 1997 and was elected a Senior Fellow of the
British Academy in 2005. Professor Zander retired from the LSE in 1998. Twenty-five years later he was still active, writing and publishing articles and new editions of his books. ==Selected publications==