Adam Kendon

Adam Kendon (4 April 1934 – 14 September 2022) was one of the world's foremost authorities on the topic of gesture, which he viewed broadly as meaning all the ways in which humans use visible bodily action in creating utterances including not only how this is done in speakers but also in the way it is used in speakers or signers when only visible bodily action is available for expression. Provided by Wikipedia