Chris Lewin was appointed chairman of the board of the %A3;2.3 billion ($4.2 billion) GEC 1972 Plan for staff of Marconi Corp. PLC, Coventry, England. He replaces John Brew, who retired last month. Mr. Lewin was also appointed chairman of the plan's investment advisory committee, a post formerly held by Mr. Brew. Mr. Lewin was previously head of U.K. pensions at Unilever PLC, London, until he retired earlier this year.