Mark Vonnegut, Son of Kurt, on Introverts and Extroverts – By Susan Cain Katherine Thinkings and poems February 27, 2012February 24, 2017 1 Minute Mark Vonnegut, Son of Kurt, on Introverts and Extroverts – By Susan Cain Share this: Click to print (Opens in new window) Print Click to email a link to a friend (Opens in new window) Email TweetShare on TumblrMorePocket Click to share on WhatsApp (Opens in new window) WhatsApp Like Loading... Related Published by Katherine Poetry writer and author View all posts by Katherine Published February 27, 2012February 24, 2017