The Boston School Committee has ratified a five-year contract with Dr. Tommy Chang to serve as the city's next superintendent of schools. It takes effect July 1.

Chang will be paid $257,000 a year under the contract ratified unanimously Wednesday night. He'll be eligible for annual performance increases of up to 4 percent.

Chang officially becomes superintendent in July, but he expects to be in Boston full-time beginning in mid-April to work with interim Superintendent John McDonough. He says he's "eager to get on the ground" and start working with Boston's educators and students.

Mayor Martin J. Walsh says Chang has the "expertise and vision" to move the schools forward.

Chang currently serves as the local instructional superintendent for the Los Angeles Unified School District's Intensive Support and Innovation Center.