Gerd Schenkel, chief executive of Tyro Payments, has left the bank suddenly, with a long time director taking his place.Rob Ferguson has taken the helm as acting managing director, effective immediately, the board said yesterday. Ferguson was managing director of Bankers Trust Australia for 14 years until the investment bank was sold to Macquarie in 1999. He was an early investor in Tyro and was at one stage chair of the board.In a statement late yesterday the Tyro board said Schenkel had "informed the board that he wishes to resign from his position in order to focus on other business opportunities and spend more time with family."The Financial Review reports that Tyro's board "initiated the departure after becoming frustrated that Schenkel was not fitting in with Tyro's fast-moving culture."Jost Stollmann, the former CEO who remained in a management position, "will become a full-time non-executive director of Tyro."