Petersohn is the second four-star athlete in the Nittany Lions' 2026 recruiting class.
Penn State last played Boston University in 1984 and Harvard in 1976.
The Nittany Lions open Big Ten Conference play at home against Maryland on September 11.
The two are the Nittany Lions' first two draft picks.
Mendelson becomes Penn State's first two-sport athlete in seven years.
