The president of San Antonio College announced Tuesday that he will retire this summer.

Robert E. Zeigler, who has been president since 2002, made the announcement during the annual Spring College Convocation.

"It was a hard decision for me to make, but after talking with my wife, Mary, I knew it was time," Zeigler said in a news release. "I will be forever grateful for the opportunity SAC has given me in my life and for the opportunities I've had to engage in this important work."

Zeigler has a long history with SAC, beginning in 1959, when he started taking classes there.

In 1971, he was a professor of history. Before becoming president, Zeigler served in various administrative roles, including executive vice president from 1997-2002.

"Bob Zeigler embodies all the qualities which we at the Alamo Colleges value most," said Alamo Colleges chancellor Bruce Leslie. "He is a caring and collaborative president, who always puts students first, values excellence and diversity, is fully engaged with his colleagues and the community, and exemplifies a positive, can-do spirit."

During Zeigler's leadership as president, SAC has consistently enrolled more than 20,000 students each semester.