"Penn State has been more than just a place of academic pursuit for me. It's been a melting pot of experiences, lasting friendships, and personal growth."
Brown was a sixth round pick in the 2020 NFL Draft.
Souliere appeared in 85 games over his four years with the Nittany Lions.
The commencement for the college will kick off at 1 p.m. on Saturday, May 4.
The forward will join the Sun Devils for his senior season.
Guðmundsson leaves with three years of eligibility remaining.