Castrina, Sean C.

Sean C. Castrina is a serial entrepreneur, business coach and sought after speaker. He has started over 15 successful companies over 20 years and this portfolio continues to grow. His companies have ranged from retail, direct mail marketing and advertising to real estate development and home services. He is the author of the bestselling startup book "The 8 Unbreakable Rules for Business Start-Up Success" which was the most endorsed startup book ever written at the time of release hailed by countless New York Times Bestselling authors and business giants.