As Sean Clifford's blindside blocker, Walker earned third-team All-Big Ten honors in both 2020 and 2021.
The former four-star recruit was dismissed from the team for an unspecified violation of team rules in 2017.
Barr, a two-time Michigan state champion, is projected to compete for the Nittany Lions at either 174 or 184 pounds once he arrives in Happy Valley.
From crowning champions to welcoming fans back home, Penn State's teams accomplished a lot in 2021.
Penn State men's hockey's upcoming series against Maine has been canceled due to positive COVID-19 tests within the Black Bears' program, the team announced Wednesday.
After spending just one season in Happy Valley, Penn State defensive tackle Derrick Tangelo is heading to the big leagues.