Zeck will help to lead the theatre as it transitions to a new business model.
Woster replaces interim managing director Robin Gillette.
Kaminski leaves her post as associate artistic director of Seattle Rep to succeed Ted Pappas in Steel City.
Janney returns to the festival as honorary chair after serving on the honorary committee at the inaugural festival in 2015.
The Texas company’s associate producer of four years steps into a top leadership role.
The longtime artistic director will step down at the end of the 2017-18 season after 18 years at the helm.
Tesori, who began the New York City Center program, joins Kauffman to program summer 2018.
Coleman will depart Portland Center Stage and join Denver Center in May.
Estle, the company’s associate artistic director, has stepped into the top leadership role.
Mark Jackson will lead American Conservatory Theater’s acting training program.