He replaces Dominic Stinton, who left BBH earlier this month to join Talk Talk as its telecoms marketing director.
Pschorr joined BBH in August 2005 as a business director with responsibility for the Vodafone and Flora accounts.
He began his career at BMW in Germany, before moving to London to join WCRS, initially to work on the German manufacturer's motorcycle advertising. In 2003, he joined Fallon, where he was a group account director.
The BBH managing director, Ben Fennell, said: "Toby will be a great head of department. Account management needs to evolve and adapt to meet the needs of our clients."
Stinton's was the second senior account departure at BBH this month. Last week, the BBH group business development director, Richard Exon, joined Rainey Kelly Campbell Roalfe/Y&R as its managing director. BBH declined to comment on any plans to replace Exon.
- Newsmaker, page 18.