Daniel Stewart Butterfield (born Dharma Jeremy Butterfield, 1973) is a Canadian entrepreneur and businessman of Polish descent, best known for being a co-founder of the photo sharing website Flickr and team messaging application Slack.Butterfield was born in Lund, British Columbia in 1973 to Norma and David Butterfield and grew up for the first three years of his life in a log cabin without running water. Butterfield's grandfather came from Poland to Canada at age 17 at interwar period. His family moved to Victoria when Butterfield was five years old; as a kid, Butterfield taught himself how to code. Wikipedia