Longtime publisher Terry Nemeth will stay on as publisher emeritus.
A season director and educator with Broadway and regional credits, he comes to ATC from Utah Valley University.
White is currently a resident artist at the Vineyard Theatre.
Mitchell will serve alongside founding artistic director Teresa Thuman.
The co-executive directors talk about the unique challenges of this moment, and how their theatre service organization is poised to meet them.
The co-founding couple will leave at the end of the season.
Frank will join the theatre this month after working for years in nonprofit theatre, most recently at New York’s Waterwell.
The program director of the Black Theatre Coalition succeeds Cassie Greer as leader of the Oregon company.
The artistic director has served 17 seasons and produced 88 shows at the Northern California theatre.
Starting Dec. 1, Slight will temporarily replace Cody Estle, who is leaving Raven to serve as artistic director of Next Act Theatre in Milwaukee.