Les Muma built a company in Tampa, merged it with a friend’s business, and shepherded their financial services company, Fiserv Inc., into a Fortune 500 powerhouse. He retired in 2006, but by then, the company had spread worldwide, providing technology products and services to thousands of financial institutions. The Mumas, who have given more than $56 million to USF in all, are the largest individual donors in the school’s 61-year history. Their names already adorn the college of business and basketball practice center. Les Muma graduated in 1966, among one of USF’s earliest classes, from a campus practically devoid of trees, let alone many classrooms.