I am making sure that my information on certain mathematicians is up to date and accurate. To this end I am looking at Robert Earl MacKenzie, who (according to my records) was born March 17, 1920. I have scoured the internet for news of his passing, but the only results I have found are inconclusive: PraBook does not record a death date, and there are 2 obituaries: one for a 2011 date and one for a 2016 date (so possibly neither one). Unfortunately it is a not uncommon name, so there may be plenty of records that refer to different people.
Does anyone out there have any inside knowledge? He is listed in this book I have as being in the dept of mathematics at Indiana at some stage.