With the recent death of author Stephen Covey, many have taken to Twitter to express their appreciation for his influence.

Clayton Christensen - @ClayChristensen

Professor at Harvard Business School and best selling author.

Jeffrey Hayzlett - @JeffreyHayzlett

Best selling author and former executive at Eastman Kodak Company.

Tony Robbins - @TonyRobbins

World famous motivational speaker and life coach.

Renee Fraser - ‏@reneewfraser

CEO, Fraser Communications.

Post Secret - @PostSecret

An art project, where participants submit anonymous secrets.

Dambisa Moyo - @DambisaMoyo

Economist and author of NY Times bestsellers Winner Take All, Dead Aid & How The West Was Lost. Named by Time Magazine as one of 100 most influential people in the world.

Anthony Herron - @BigAntHerron

Football analyst calling games on multiple platforms such as the NFL Network and NBC.

Corletta J. Vaughn - @BishopCVaughn

Senior Pastor of Holy Ghost Baptist Cathedral Detroit, Michigan.

Jessica Holmes - @happyfeetholmes

Comedian, speaker and author of 'I Love Your Laugh'.

Bob Whitman

CEO of FranklinCovey Co.