Rod is originally from Paris, Texas and moved to Rockwall in the 3rd grade where he atteneded Nebbie Williams Elementary, Williams Middle School, and graduated from Rockwall High School in 2006. After graduating from RHS, Rod studied Music Performance at UNT, where he received his Bachelor of Music Performance degree.  Afterward, Rod received his Master's degree in Music Performance from Indiana University. He joined the Rockwall-Heath High School Music Education program in 2016 as the Director of Percussion.​

Mr. Kosterman enjoys composing music for marching show programs and concerts. "I absolutely love sharing music performance and composition opportunities with people!" Teaching at Rockwall-Heath makes him feel enthusiastic about sharing his passion for music. "We have the most amazing staff, students, and community for band in the entire world!! I love it here!"​

When Mr. Kosterman isn't teaching or composing music, he is watching or reading a Sci-Fi or thriller movie or book. Some of his favorites are Star Trek, Battlestar Galactica, Hitchhiker's Guide to the Galaxy and anything by Stephen King. His absolute most favorite thing in the world is his cat, Spooky.