Kosminsky has previously worked with Daybreak co-executive producer David Aukin and Hal Vogel on projects including The Government Inspector and Channel 4's two-part drama Britz.
Daybreak, an offshoot of Mentorn, is already lining up a slate of projects for Kosminsky to work on as director, writer or executive producer. Those include Terrorists, about suffragettes, and a project about the Litvinenko poisoning, both for Channel 4.
Daybreak also continues to develop other projects, including a film about the fall of apartheid written by Paula Milne.
Aukin, former head of film at Channel 4 and an executive producer on Mrs Henderson Presents, and Vogel, whose productions include Game Over: Kasparov And The Machine, launched Daybreak in September 2006.
Vogel is also developing a feature film with director Saul Dibb based on Julie Gregory's bestseller Sickened.
Britz, the controversial drama about being second-generation Muslim in Britain today, was a co-production between Daybreak and Stonehenge Films with Aukin and Vogel as co-executive producers.
Kosminsky's feature films include Wuthering Heights starring Ralph Fiennes and Juliette Binoche and White Oleander starring Michelle Pfeiffer and Renee Zellweger.
Daybreak's past productions include The Trial Of Tony Blair and Confessions Of A Diary Secretary.