Jack Van Geem
retired as Principal Percussionist and Assistant Timpanist with the San Francisco Symphony in 2012, a position he held for 32 years. He is Chairman of Percussion Studies at San Francisco Conservatory where he has taught since 1991. He taught at The Colburn School in Los Angeles from 2006 to 2015. Having taught at nearly every ZMF event since 2001, Jack estimates that, all told, he has spent half a year of his life at ZMF! He also serves as its Vice President.

Van Geem began playing the marimba at age four. He studied percussion with Tony Cirone and Jerome Neff earning his Master of Arts degree from California State University at Hayward. He studied contemporary percussion performance with Cristoph Caskel in Germany in the mid-70s on a scholarship from the University of California at Berkeley. Following that, he was percussionist for the San Francisco Ballet Orchestra for five years until he won the SFS position.

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.

Zeltsman has presented recitals and marimba master classes across the U.S. and Europe and in China, Japan, and Mexico. Venues include the Tanglewood Festival of Contemporary Music, Zankel Hall at Carnegie Hall in New York, subscription concerts with the San Francisco Symphony, and Shenzhen Concert Hall.

Zeltsman is a Professor at joint institutions Berklee College of Music and Boston Conservatory at Berklee and heads the Conservatory percussion department. She has taught marimba at both schools since 1993 in positions that were created for her, and where she created unique undergraduate and graduate courses of study focused on marimba. Since 2001, she has been Artistic Director of Zeltsman Marimba Festival which produces two-week seminars (ZMF) and 4 to 6-day seminars (ZMF On Tour) held in varying locations around the world (www.ZMF.us). In the fall of 2013, Nancy was appointed regular guest teacher of marimba at Conservatorium van Amsterdam where she teaches two weeks each year.

Her method book, "Four Mallet Marimba Playing: A Musical Approach for All Levels" (Hal Leonard Corporation) is widely used. She edited "Intermediate Masterworks for Marimba": 24 marimba solos presented in two volumes, commissioned through ZMF with support from over 200 contributors (C.F. Peters Corporation). She was a jury member for the Tromp International Percussion Competition in Eindhoven, the Netherlands in 2010, 2012, 2014 and 2016.

Recordings include three solo CDs ("Woodcuts," "See Ya Thursday" and "Sweet Song"); three CDs with Marimolin ("Marimolin," "Phantasmata," and "Combo Platter"); William Thomas McKinley's marimba concerto recorded with Boston Modern Orchestra Project; and a duo marimba CD with Jack Van Geem ("Pedro and Olga Learn to Dance"). Several videos are on YouTube (Messiaen, Michalek, Levitan, Bernstein).

Nancy graduated from New England Conservatory of Music with a degree in percussion performance (BM, 1982) where she studied with Vic Firth. Other teachers included Ian Finkel, Robert Ayers, Donald Marrs and Dave Samuels. A Pearl/Adams artist, she endorses marimbas made by Adams Musical Instruments (in the Netherlands) and her signature line of Encore Mallets. Nancy resides in Boston, Massachusetts.