<a href="https://en.wikipedia.org/wiki/John_E._Walker" class="extiw" title="en:John E. Walker">Sir John Ernest Walker</a> - British chemist; Emeritus Director and Professor at the MRC Mitochondrial Biology Unit in Cambridge, and a Fellow of Sidney Sussex College, Cambridge - here at lcture at Royal Danish Academy of Sciences and Letters, Copenhagen, Denmark - November 2018
<a href="//commons.wikimedia.org/wiki/User:Moeng" title="User:Moeng">Mogens Engelund</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>