Dionissios N. Assanis is a Greek academic administrator, scientist, engineer and author.

Assanis earned his bachelor's degree in Marine Engineering from Newcastle University in England (1980).

[4] Assanis served as Provost and Senior Vice President of Academic Affairs of Stony Brook University, a position he held from 2011 to 2016.

[5] He also served as vice president for Brookhaven National Laboratory Affairs.

He then served as Director of the Automative Research Center from 2002 to 2009, and the Founding Director of the General Motors-University of Michigan Collaborative Research Laboratory for Advanced Engine Systems from 2002 to 2011.