The messaging app that is an acronym for "Searchable Log of All Conversation and Knowledge" was founded by a business of what descent?
Stewart Butterfield 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.
Luke Johnson (businessman) Luke Oliver Johnson (born 2 February 1962), is a British entrepreneur, best known for his involvement with Pizza Express chain. He is a former chairman of the Royal Society of Arts and Channel 4. He writes a weekly column for "The Sunday Times". Johnson calls himself a "projector", in line with the 17th century term for a man involved in many different businesses. However, others regard him as just a serial entrepreneur.