Sharon Que is a violin maker and mixed-media artist who has worked with Joseph Curtin since 1986. She now has her own Ann Arbor studio dedicated to violin restoration, and works with Joseph Curtin on a project basis.   

Guido Bruschstein is a woodworker and musician. He has worked with Joseph Curtin on a part-time basis since 2000.

Alex Sobolev is a designer who is currently collaborating with Joseph Curtin on a number of research projects, including the digital violin.