In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Q: John David Jackson ( January 19 , 1925 May 20 , 2016 ) was a Canadian American physics .
A:
John David Jackson ( January 19 , 1925 May 20 , 2016 ) was a Canadian American physics professor emeritus at the University of California , Berkeley and a faculty senior scientist emeritus at Lawrence Berkeley National Laboratory .