Prato was the founding director of the All-Sports Museum and an avid Penn State fan.
Barry Fenchak, who has publicly clashed with board leadership, was declared ineligible under new bylaws.
Carter's agent said he still believes the former Penn State star will be the No. 1 overall pick in the NFL Draft.
Markley made the All-Big Ten Freshman Team in 2022.
That's the second time McGloin quit his job this week.
The graduate student will have one year of eligibility remaining.