Erik C. Wahl is an American graffiti artist, speed-painter, author, motivational speaker, and entrepreneur based in San Diego. He owns The Wahl Group, a consultancy firm, and has spoken at conventions by Microsoft, Disney, NBC and Honda. He also is the author of the #1 bestselling business book,  UNTHINK, which was honored by prestigious CEO Reads as being awarded the #1 Business Book of the Year in 2013.