Boom Chicago is an international creative group, based in Amsterdam, Netherlands, that writes and performs sketch and improvisational comedy at the Rozentheater. The group was founded in 1993 by Americans Andrew Moskos, Pep Rosenfeld and Ken Schaefle, who named it after their hometown and the home of improvisational (improv) comedy. In 1994, they moved from the Iboya on the Korte Leidsedwarsstraat to the Lijnbaansgracht in the space that later became the Sugar Factory and today Lovelee. In 1998, they took over and restored the Leidseplein Theater in the city's theater and club district. Over the years, Ken Schaefle left and Saskia Maas became CEO. In 2013, the comedy show moved to their more spacious home on the Rozengracht, while the Chicago Social Club remains at the Leidseplein.