Researcher Aleksander Essex presented to the December 1, 2016 Toronto Executive Committee meeting that was considering a report recommending against Internet voting. You can see Aleksander’s presentation from 9:38 to 13:56 in the meeting video below.
He states “an overwhelming number of cybersecurity experts view Internet voting as one of the most challenging open problems in security, for a great many reasons”.
For more information about the 2016 Toronto report that was being discussed, see Toronto Internet voting.
Dr. Essex was co-author of the 2014 Toronto RFP report Internet Voting for Persons with Disabilities – Security Assessment of Vendor Proposals (PDF, Internet Archive).
For more about Aleksander Essex see my list of computer science experts