The HIST Award for Outstanding Achievement in the History of Chemistry (2013-present) is given by the Division of the History of Chemistry of the American Chemical Society (ACS). The award was originally known as the Dexter Award (1956-2001) and then briefly as the Sidney M. Edelstein Award (2002-2009), both given by the ACS.
The Dexter Award was originally established by Sidney Milton Edelstein, a founder of the Dexter Chemical Corporation, to recognize an "outstanding career of contributions to the history of chemistry". As the Dexter Award, it was sponsored by the Dexter Corporation except for its final two years, when it was sponsored by the Mildred and Sidney Edelstein Foundation.
The award was briefly known as the Sidney M. Edelstein Award from 2002 to 2009, but was still given by the ACS. As such, the Sidney M. Edelstein Award should be distinguished from the Sidney Edelstein Prize (1968-present), which has been given continuously since 1968 by the Society for the History of Technology to recognize "an outstanding scholarly book in the history of technology."