Graham Booth, a film-maker who has worked with the indie on many projects, takes up the new role of creative director with immediate effect, while BBC Bristol executive producer Dick Colthurst joins as executive producer. Both report to managing director Andrew Jackson.
Booth will oversee all the indie's creative output, developing new formats and finding presenters. His Tigress credits include 17 hours of programming for Animal Planet, featuring snake expert Austin Stevens. He also collaborated with the indie on Dolphin Murders, a one-hour special due to air on Five later this year.
Colthurst, who joins in September, has been handed specific responsibility for leading the company's drive into science and adventure programming.
Tigress executive chairman Jeremy Bradshaw said: 'The adventure genre is a trick we've been missing. There's great potential for UK/US co-pros and opportunities to develop formats for US broadcasters.'
At the BBC Colhurst oversaw shows such as Hunting Chris Ryan, as well as several series with survival specialist Ray Mears.