In this show, Mark Schaefer and two friends, Samantha Stone and Chad Parizman, weave a story of his greatest professional accomplishment -- ten years in the making. It's not a book, it's not a famous speech. This is the story of 30 people who took a risk together.    Samantha Stone is the founder and CEO of The Marketing Advisory Network. She is a teacher, consultant, marketing strategist, researcher, and the author of Unleash Possible.    Chad Parizman has been a digital marketing strategist for HGTV and Pfizer and currently leads brands into an effective social audio strategy through his company Ader Communications.