His feature articles, profiles and essays have appeared in more than 100 publications. His six include Blades of Glory: The True Story of a Young Team Bred to Win, which chronicles a season spent with a successful Minnesota high school hockey team; Hammerin' Hank, George Almighty and the Say Hey Kid: The Year that Changed Baseball Forever, an account of the 1973 baseball season; and ghost-wrote Esera Tuaolo's aubiography Alone in the Trenches: My Life as a Gay Man in the NFL.
Rosengren holds a masters in creative writing from Boston University and teaches at the University of Minnesota and the Loft Literary Center in Minneapolis. He is a member of the American Society of Journalists and Authors and the Society for American Baseball Research.
- Halsey Hall SABR profile Accessed 4 July 2009