Ragen

This book was Inspired by modern day entrepreneurs such as Martha Stewart, Tim Ferris, Seth Godin, John Lee Dumas, Chandler Bolt, Jamie Tardy, Bob Burg, Donna Kozik, and Connie Ragen Green.

Designed by Robert "Bob" Appleby Ragen, citation Friden introduced RPN to the desktop calculator market with the EC-130 supporting a four-level stack in June 1963.