Jeff is the core member of String Theory. He partners with other musicians to deliver the right combination for your venue or event.

Jeff begged his parents for an electric guitar at age 7 (thank you Mike Voigt, wherever you are, for your inspiration). After spending 10 years in basements and garages honing songs by the Santana, Led Zeppelin, and Cream, he developed an interest in jazz. As a Computer Science major at the University of Michigan, he spent a year in the University Jazz Band under trumpeter Louis Smith, as well as other university groups, local musical productions, and a cover band with a Chicago-style lineup. Jeff rekindled his love of jazz in the 2000s when he started attending Maryland Summer Jazz and the Jazz Band Masterclass workshops (now under the JazzWire umbrella), where he met many of his partners. Besides his own projects, Jeff is also a regular member of the Bob Schwartz Quartet.

John has performed with jazz groups as a leader and sideman locally over the last 30 years. John, as winner of the 2017 Lifetime Achievement Award for Volunteering in Fairfax, and his group Stolen Moments, performed over many years as volunteers at countless fundraising events for non-profits in Northern Virginia. A benefit concert with vocalist Ericka Ovette was recorded and released on the CD, "Songs To Feed The Soul" in 2006. John resides in Fairfax, Virginia.

The son of a classical pianist and teacher, Guy grew up studying classical cello and voice. When he turned 18 he bought a (bass) guitar to punish his Mom and started playing in rock bands. Contrary to his plans, his mother found this charming and hired his band to play at her parties. Guy spent his 20s and 30s playing in rock, blues, funk and folk bands, largely in the greater Washington, D.C., area. In his thirties he began seriously studying jazz and eventually took up the acoustic double bass. He now plays in a variety of small jazz groups around the area.

Allan Bentkofsky started his musical career at age 9 on the piano, switching to bass at age 12. During high school he studied classical bass under Marvin Lewis on Long Island, New York. He attended New York’s All-State Orchestra as a junior and senior and was awarded first chair both years. Allan also attended All-Eastern orchestra in Boston. In the early 1990s, Allan became more interested in playing jazz and joined with several friends to form the Java Jazz band, which performed around Central New York. He has performed with the Auburn Chamber Orchestra, the Loudoun Symphony and Loudoun Jazz Ensemble. Besides joining Jeff regularly, he currently plays with Linda Andersen and Friends and several other duos, trios and quartets.

Rebecca Chaney is a music educator who has been teaching private violin and viola lessons for over 22 years. She received her Bachelor’s Degree in Music Education from Penn State University in 2010. She has had extensive experience as a professional music educator in the Loudoun County Public School system, as well as teaching privately. She has studied voice since the age of 14 with teachers such as Barbara C. Lewis, Joanna Pascale, Dr. Darden Purcell of GMU, and Claudia Catania. Rebecca has performed in many choirs, festivals, and musicals with leading roles. At George Mason, she had the opportunity to solo with the Jazz combos and the Big Band. She currently still gigs around the D.C. area, singing and playing her viola.

Sam performs regularly at various area venues, as well as joining Jeff for private events. Sam is a triple threat, also bringing piano and clarinet chops to the gig.

Ken was a professional music educator in the Fairfax County school system, and currently plays in a number of local musical productions and events, as well as joining Jeff in a duo.

Jerry Bresee has been making music as far back as he can remember. He has performed with jazz combos, funk-driven horn bands and full orchestras. As a songwriter, he's performed at venues from Seattle to Atlanta, including the Kennedy Center Millennium Stage. He has won several songwriting awards and has twice been a showcase artist for C.F. Martin Guitars. As a jazz musician, he has studied with top jazz professionals in the Washington area, held the guitar chair with the Loudoun Jazz Ensemble big band for most of a decade, and now performs regularly in the State College, Pa., area.