He officially starts his new job July 1, Byers said.
The person who takes over Gersen's job temporarily could be someone within the school system, someone who has retired from the school system or someone who works for the Maryland Board of Education, she said.
The school board wants to hire a permanent superintendent by April 1.
The nationwide search won't start until late summer or early fall.
The board is considering hiring a consultant, who would correspond with candidates and weed out those who don't meet the board's qualifications.
Six of Maryland's 23 school districts are searching for superintendents, Byers said.
The hiring process will be similar to the one used to select Gersen 10 years ago.
"The community should be involved from the very beginning," said board member Doris J. Nipps. "They need to feel a part of that whole process."
After getting input from the public, the board will determine the requirements for the next superintendent.
Advertisements won't go out until November, Byers said.
Interested candidates will be sent a brochure listing the job requirements. If they are still interested, they will receive an application.
The board's focus now, however, is on finding an interim superintendent. Doing that quickly is especially important for the staff, Byers said.
"They need to know who will be their leader for the next year. He or she is the CEO of the system," she said.