“Since day 1, Sam has had my back and helped me become the best quarterback I could be. I cannot thank him enough for showing me how to be a professional in every sense of the word. He is a leader, mentor, and great person,” Rosen wrote. “He and (backup QB) Mike Glennon couldn’t have been more supportive at a time that I thought might be a bit tense or awkward today. I couldn’t be more thrilled to be in a QB room with two of the most selfless people I’ve ever been around as I start my career as a quarterback in the NFL. For that I say thank you,” he also wrote.Rosen, who was a quarterback for UCLA before he was drafted, told the league’s online magazine earlier this year that a lot of the trash talk that was directed at him on the field during college was antisemitic.A 2014 profile noted that Rosen became a bar mitzvah and attends seder every Passover, but he also celebrates Christmas and he called himself “kind of an atheist.” The quarterback’s father is Charles Rosen, a noted orthopedic surgeon. His mother, Liz Lippincott, is Quaker and is the great-great-granddaughter of Joseph Wharton, who founded the prestigious Wharton business school at the University of Pennsylvania.