Mitchell chose Penn State over offers from Arkansas, BYU, and Oklahoma State.
Emily Maddock was the lone Nittany Lion to earn a nod to the All-Big Ten first team after an impressive season.
Sessoms will join fellow Penn State alumni Myles Dread, Tony Carr, Josh Reaves, Shep Garner, Mike Watkins, Jamari Wheeler, Trent Buttrick, and more on the team.
Kristin O'Neill, Gretchen Gilmore, and Ellie Hollin were all recognized ahead of the NCAA Tournament.
Jack Fracyon, Matt Traynor, TJ Malone, Grant Haus, and Jack Posey each earned All-American nods from USA Lacrosse Magazine.
The men's team fell to the No. 7 spot, while the women's team jumped to No. 20 in this week's Inside Lacrosse rankings.