Felton Williams will lead the policymaking body of the national coalition representing 70 of the nation's largest urban public school systems.
Anthony Hamlet's hiring had been on hold after claims arose that he overstated the academic turnaround at the Palm Beach, Fla., schools where he once served as principal.
"Simply put, I am ready to take on new challenges," Henderson wrote in the letter to parents and community members. She leaves the job Sept. 30.
Michael Contompasis, a 1957 graduate of Boston Latin School, served as headmaster of the school from 1976 to 1998 and later as district superintendent from 2005 to 2007.
DeRay Mckesson left his career in education in 2014 amid the unrest in Fergsuon, Mo., after Michael Brown, an unarmed black teenager, was fatally shot by a white police officer.
Valeria Silva will depart the superintendent job on July 15, but will continue to serve as a consultant to the district. Her separation package is worth nearly $800,000 in salary and benefits.
The package of bills will help Detroit schools pay off $467 million in operating debt and provide $150 million in start-up funding for a new debt-free district.
For the first time, the federal civil rights data released by the Department of Education included information on the number of hours and days that students in juvenile facilities have access to educational programs. Advocates want more.
New York City Mayor Bill de Blasio wanted a three-year extension, but New York state Senate Republicans offered a one-year deal.
The district started voluntary lead testing in April, and, so far, has found elevated lead levels at fixtures, such as sinks and drinking water fountains, at 23 schools.