Professor Lewis joined the Marist faculty in 1984 and has taught a wide range of courses in studio art, art history, and digital media. In 2019, he was elected Department Chair after previously serving in that role from 1995 to 1997 and 2001 to 2010. From 1997 to 2000, he was the College’s Dean of Academic Programs/Asst. Vice President for Academic Affairs. He has a strong belief in the importance of international education and was part of the team that established the College's campus in Florence, Italy. Currently, he is the Academic Coordinator for Marist College's programs in Italy and Graduate Director for the MA in Museum Studies in Florence.

His recent teaching focuses on courses in Digital Media, particularly digital painting and animation. In addition, beginning in 2006, he has organized short term abroad courses to Italy, France, Netherlands, England, Greece, Turkey, and Japan and taught in the Departments' Venice Biennale program beginning with its inception in 2009.

Along with his wife Susan, he is the author of "The Power of Art", an art appreciation text published by Cengage, which has been used in more than 350 colleges and universities. The revised third edition was released in January 2018.

He also has written a new textbook with his colleague James Luciana, "Digital Media Foundations: A Hands-on Guide for Artists and Designers," published in 2020 by Routledge/Focal Press.  They previously collaborated on "Digital Media: An Introduction", published by Prentice-Hall in 2005.