Venkatesh Rao@vgrRIP John Holland, GA pioneer. Hosted him once in a seminar I organized. Self-effacing, curious despite legendary repQuote TweetMelanie Mitchell@MelMitchell1·Aug 10, 2015John Holland has passed away. A giant of complex systems science. To me an inspiration, teacher, mentor, friend.7:18 PM · Aug 10, 20154 Retweets1 Like