Rennie has also been involved with several television programs and podcasts as well as multiple writing projects, including his latest position as a deputy editor on the staff of Quanta Magazine.

Rennie then worked for the better part of a decade in a laboratory at Harvard Medical School before commencing his career as a science writer and editor.

Rennie has had a varied career in addition to his time as an editor at Scientific American, including positions in higher education, as an author, and as a television host.

[4] Rennie wrote the blog The Savvy Scientist for SmartPlanet between November 2011 and September 2012[5] and penned a handful of articles for the General Electric sponsored online magazine, Txchnologist, in 2011 and 2012.

[7] Rennie is listed as adjunct faculty for the graduate Science, Health and Environmental Reporting Program at New York University's Arthur L. Carter Journalism Institute.