Jim Shoemake, principal of Casa Roble High School, announced he would be leaving the school in a letter on its website Monday.
"It is with much anticipation, mixed with some sorrow, that I tell you I have been offered and have accepted the position of senior director of labor relations for the San Juan Unified School District," he wrote.
Shoemake will work with the district's 5,000-plus employees, and the leaders and executive boards of seven labor unions in his new position.
He said that in his three years at Casa Roble, relationships among teachers, staff, parents, administrators and the public have improved.
Shoemake said his last day will be Feb. 28. Vice Principal Michele Lorenzo will be the school's interim principal until June 5. Pasteur Middle School Vice Principal Suzanne Ambrosini will be the interim vice principal until June 5.
San Juan Unified will conduct a search for a new principal, with interviews April 2. The interview panel will include parents, teachers, district and school staff, union representatives and a student.