While in college, Keir started to collaborate with Joseph Gordon-Levitt through his company HitRecord. That collaboration eventually led to a full-time position with HitRecord as Music Coordinator and then Associate Music Producer. His work there has resulted in four Emmy Nominations and winning two of them. In 2022, Keir co-scored the hit TV series “Single Drunk Female” with Ryan Lott of Son Lux. In recent years, he has been working closely with Son Lux (Ryan Lott) as their Score Coordinator and Additional Arranger. His work can be heard in the recent Marvel film “Thunderbolts*”. Keir is currently working with Son Lux on the Amazon/MGM film “Your Mother Your Mother Your Mother” .