Nancy Zeltsman is a leading marimba performer, teacher, and festival director. She has premiered over 125 solo/chamber marimba works including compositions by Paul Simon, Michael Tilson Thomas, Gunther Schuller, Carla Bley, Louis Andriessen, Steven Mackey, Lyle Mays, and Robert Aldridge. Alejandro Vinao and Paul Lansky both wrote their first pieces for marimba for Nancy (which have been followed by many other works for marimba and percussion). From 1985 to 1996, Nancy was a member of the duo Marimolin with violinist Sharan Leventhal. (The duo has performed together again occasionally since 2015.) The 80 works they premiered probably stand as the largest body of pieces for marimba and another instrument.
Jack Van Geem has been the principal percussion and assistant timpanist of the San Francisco Symphony for 23 years. He has performed and recorded with the symphony as a mallet soloist, solo timpanist, snare drum soloist and featured solo percussionist. Before joining the Symphony in 1981, he performed for five years with the San Francisco Ballet Orchestra. He studied in Germany with Cristoph Caskel on a Hertz Fellowship and holds B.A. and M.A. degrees from California State University–Hayward, where he also taught. In addition to his work with the San Francisco Symphony, Van Geem has recorded and performed chamber music, music soundtracks and marimba and xylophone music. He recently finished recording a CD of marimba duets with Nancy Zeltsman and premiered Island Music, a work written especially for them by Michael Tilson Thomas.