Ryan Anderson was one of 12 finalists selected for the award that also included Andre Iguodala and Pau Gasol.
For more information regarding this award, give this article a read. Among other things, it includes how players are nominated and then selected.
"The award recognizes the player deemed the best teammate based on selfless play, on- and off-court leadership as a mentor and role model to other NBA players, and commitment and dedication to team."
"A panel of NBA Legends nominated six players from each conference for the award and then nearly 300 NBA players submitted their votes through confidential balloting conducted by the league office."