Jerry Epstein, well known by math and physics educators for his "Basic Skills Diagnostic Test" (BSDT) [Epstein 1997)] and "Calculus Concept Inventory" (CCI) [Epstein 2013)] has died; see. e.g. Fitzcarl Reid's announcement at Epstein's Facebook page
In addition Jerry is well known by folk music aficionados for his
musical talents, including his powerful singing voice - see e.g.:
Richard Hake, Emeritus Professor of Physics, Indiana University; LINKS
REFERENCES
Epstein, J. 1997. "Cognitive Development in an Integrated Mathematics
Program," J. College Science Teaching 27: 194201. See also at
Epstein, J. 2013. The Calculus Concept Inventory Measurement of the
Effect of Teaching Methodology in Mathematics, Notices of the AMS