Mayer will take over some tasks previously performed by founding artistic director Philip Boehm.
Ivers, currently a.d. at Arizona Theatre Company, will succeed Marc Masterson beginning in March 2019.
Currently the head of new-works incubator New York Stage and Film, Pfaelzer will succeed longtime a.d. Tony Taccone.
The young British director, currently an associate at London’s National Theatre, will succeed Michael Kahn at D.C.’s classical mainstay.
Replacing Chris Coleman, she’ll join managing director Cynthia Fuhrman as a co-leader starting Sept. 15.
The acclaimed director will take the helm of the summer musical-theatre revival series, which she co-led this past year.
Midgett will join the Alaska company’s leadership team this fall.
Cofield will play a key role in furthering refining and implementing CTH’s artistic vision through his new position.
Ybarra will start her transition from the Public Theater to Center Stage in October.
Executive director Kim Whitener will step down, and Meredith Lynsey Schade and Brenna Thomas will be promoted.