Jonny Popper has particular expertise in regeneration, development and planning-led issues in London as well as health service change projects. His key clients currently include the temporary relocations of the House of Commons and House of Lords for the parliamentary estate, Cargiant at Old Oak Common, Tottenham Hotspur FC, Wembley Park for Quintain, corporate work for HB Reavis, Tottenham Hale for Argent Related, and Borough Yards for MAKE. A former NHS management trainee, Popper went on to work as a research assistant to Harriet Harman, then shadow chief secretary to the treasury (later moving to employment), and then for Nick Brown (then shadow minister for health). Popper is an accomplished poker player and juggler (of knives as well as clients).