Sean Diller is Treasurer of the Regional Orchestra Players’ Association (ROPA), elected to the position in 2018 at the Portland, Oregon annual conference. Prior to being the Treasurer, Sean has served as Member-at-Large from 2016 to 2018, as well as Delegate for the Southwest Michigan Symphony Orchestra (SMSO) from 2014 to 2018. Sean is also currently the Vice President of Local 232-278. Sean serves as Third Chair Viola for the SMSO and has been previously Chair of the Orchestra Committee from 2015 to 2017. Sean has also served on the Musician’s Committee’s Negotiation team. He has subbed with South Bend Symphony and plays with other ensembles in the area.