What is the fine-grained topic of the following text: In 1988 he became Head of Education Personnel at Waltham Forest followed by promotions to top jobs as Assistant Director for Education in Birmingham (1990), Head of Personnel and Democratic Services at Thurrock Council (1997) and Executive Director, Corporate Services at the Greater London Authority (2001) where he helped develop the structures and operations for the new London Government. Only return the topic.
Career progression and roles of a specific individual in the field of Education and Corporate Services.