Grossman has presented hurdy gurdy workshops and lessons with Valentin Clastrier, Matthias Loibner, Maxou Heintzan and Simon Wascher.
French musician Valentin Clastrier (born 1947) is one of the few performers in the world specializing in contemporary music for the hurdy-gurdy; before Clastrier, the instrument was used primarily in the performance of European Medieval and folk musics.
Valentín Alsina | Karl Valentin | Valentín Alsina, Buenos Aires | Joseph Valentin Boussinesq | Valentin Serov | Rey Valentin | Charles-Valentin Alkan | Valentin Zarnik | St. Valentin | Valentin Yordanov | Valentin Yanin | Valentin Fuster | Valentin Clastrier | Valentin | José Valentín | Bobby Valentín | Valentin Vodnik | Valentin Tomberg | Valentin submarine pens | Valentin Stocker | Valentin Stănescu | Valentin Otto | Valentin Nikolayev (wrestler) | Valentin Kuzin | Valentin Hristov | Valentin Haüy | Valentín González | Valentin Gheorghiu | Valentin Berlinsky | Valentin Adamberger |
Many of the current hurdy gurdy players use his instruments, including Valentin Clastrier, Gilles Chabenat, Germán Diaz, Tobie Miller, Matthias Loibner, Ben Grossman, Marc Egea and Hållbus Totte Mattson.