Stephen Covey, author of the book 'Seven Habits of Highly Effective People' died today in Idaho at the age of 79. Other books by Stephen Covey included, "First Things First," "Principle-Centered Leadership," and "The 8th Habit: From Effectiveness to Greatness." 'Seven Habits,' sold more than 20-million copies. Covey's family says he died from residual effects of an April bicycle accident.

Once named one of Time magazine's 25 most influential Americans, according to his biography, Covey "made teaching principle-centered living and principle-centered leadership his life's work."

He founded Covey Leadership Center, which in 1997 merged with Franklin Quest to create FranklinCovey Co. The company is a "global consulting and training leader in the areas of strategy execution, leadership, customer loyalty, sales performance, school transformation and individual effectiveness," with 44 offices in 147 countries.

Covey and his wife, Sandra, lived in Provo, Utah. He was a father of nine, a grandfather of 52 and a great-grandfather of two, according to the website.