She is also the conductor of the Petit Ensemble, the Young People’s String Orchestra, and the Intensive Community Program Orchestra at the Boston Youth Symphony Orchestras. She was the founder and conductor of the Longy Concertino and Sinfonietta. She is on the string faculty at NEC and at the Rivers School Conservatory (RSC). At RSC, she also is the founder and director of Camerata Strings, an advanced string ensemble. She serves as an adjudicator for various local concerto competitions, and leads orchestra workshop/clinics in local schools.

She is a very active chamber musician, and is a past participant of Yellow Barn Music Festival and Apple Hill Chamber Music Festival. She plays regularly with a number of local chamber groups, both as a violinist and a violist. She was a longtime member of the Lexington Symphony, and has performed with many other orchestras in the Boston area. Marta is also faculty of the BYSO and Rivers Conservatory.