Colby's Web page, the unimaginatively-named ColbyCosh.com, has been visited more than two million times since June 2002. In print, he is a frequent contributor to the comment pages of Canada's National Post newspaper and is a columnist for the Western Standard magazine. He has also written for The American Spectator, the Los Angeles Times, the Calgary Herald, the Ottawa Citizen, the National Post Business Magazine, the Montreal Gazette, Macleans.ca, The Comics Journal, and others. From 1997 to 2003, he was a senior editor of the influential Alberta Report magazine. He has also been a frequent guest on Canadian talk radio, has commented on Canadian politics for the BBC, and has given public lectures on the challenges that weblogging presents to traditional news media.

Colby's career in prose began in 1992, with a stint as a researcher for the Alberta in the 20th Century series of history books. He went on to oversee the assigning and editing of Volume 8 of the history series, "The War That United The Province 1939-1945", and wrote some of it, including a long chapter on Bomber Command. He has also written chapters for the series about the grain-storage crisis of the 1950's (Vol. 9) and the postwar history of Canada's Indians (Vol. 10).

Colby was born in Edmonton in 1971 and grew up in the small town of Bon Accord, about twenty minutes' drive north of the city. He is a 1993 arts graduate (with distinction) of the University of Alberta and did post-graduate work in European intellectual history with the legendary libertarian scholar Ronald Hamowy. Today he shares his Edmonton home with two cats, Nigel and Eleanor.