Krieger will also work on the film's soundtrack with Ray Manzarek's son Pablo and composer William Ross,
He's also hopeful that Harrison Ford can be persuaded to portray Manzarek, reported Variety.
The 'Indiana Jones' star worked as a stagehand and second camera assistant for Doors during the band's heyday in the late 1960s.
'The Poet in Exile' is an exploration of the urban legend that Morrison is still alive.
Manzarek set up the project in 2011 with Tim Sullivan, who's writing, directing and producing through his New Rebellion Entertainment banner.
The band has been documented many times. It was the subject of Oliver Stone's 1991 feature 'The Doors' and another documentary 'When You're Strange'.