Manny began his career at the Inner London Education Authority, following completion of an LLB Honours degree at University College London. He then gained a Masters degree in Manpower Planning and shortly afterwards became a Corporate member of the Institute of Personnel & Development (CIPD) specialising in Human Resources in the public sector.
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. He was then appointed as Chief Executive of the London Development Agency in 2004 where he successfully led the land assembly for the London Olympics.
In 2008 he was awarded an Honorary Doctorate of Business Administration for services to regeneration and development in London.
Manny became Managing Director of Watford Borough Council in 2009 which remains his current executive position. As a non-executive director, he held the role of Deputy Chair of Mid-Essex Hospital Trust for two terms and chaired its Finance & Performance Committee. With a strong commitment towards disability rights, he is a trustee at Golden Lane Housing, a charity providing housing for people with a learning disability and also the Chair of Habinteg, a regulated housing association providing accessible homes for people with a physical disability.
Manny was appointed as a non executive director at EPUT in February 2018.