Timothy was founder, artistic director, and cellist of the Art of Music Chamber Players in Boston for 10 years. He was also a founding member and is a current performer in the South Coast Chamber Music society for the last 13 years. He recently purchased Copley Chamber Players Inc which is a performing organization as well as a company that provides musical ensembles for functions, events and weddings.​

His freelance work includes work with the Boston Symphony Orchestra, the Boston Pops Esplanade Orchestra, the Opera Company of Boston, Boston Ballet, Pro Arte Chamber Orchestra, Boston Classical Orchestra, the Florida Orchestra (Tampa) as well as just about every other type of freelance work available in Boston. He has also taught for many years in various towns and music schools since 1984, teaching both private cello and as a chamber music coach, and in his private studio in Needham.

Mr. Roberts holds degrees in Performance from New England Conservatory, and Northwestern University, and he pursued a doctorate at the Cleveland Institute of Music. He performs on a Gabriello cello made in Florence, Italy in 1751.