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
<https://www.facebook.com/groups/772778829473519/>.
Epstein, J. 2013. “The Calculus Concept Inventory — Measurement of the Effect of Teaching Methodology in Mathematics,” Notices of the AMS60(8): 2-10; September; online as a 483 kB pdf at <http://bit.ly/17a8XJd>.