| Guest Name | Information | Last Appearance |
|---|---|---|
| David LaCarte | ManagerFracwear | |
| Dr. Michael Lacey | NA, Atlanta Sleep Medicine Clinic | March 10, 2012 |
| Desmond Lachman | Senior Fellow, American Enterprise Institute | April 9, 2012 |
| Elizabeth Lake | CEO, vNacelle | April 9, 2012 |
| Tim Lambert | Land Owner, Shanksville, PA (Flight 93 Crash Site) | September 12, 2011 |
| Harvey Lamm | Founder, Subaru of America | September 15, 2011 |
| Ray Lane | Executive Chairman, Hewlett Packard | April 9, 2012 |
| Mike Langer | President, Westmoreland Cultural Trust | June 27, 2011 |
| Mark Laskow | Chief Executive Officer and Managing Director, Greycourt & Company, Inc. | June 15, 2012 |
| Joseph Lawrence | Attorney, Strassburger McKenna Gutnick & Gefsky | April 9, 2012 |
| Patrick Leahy | Co-Founder, Airtime For Email | May 12, 2012 |
| John Lee | Founder & CEOInternational Investigative Services LP | June 29, 2011 |
| Patrick Lencioni | Author/Speaker, The Table Group | February 7, 2012 |
| Dan Leri | Director - Innovation Park OfficePenn State Center | September 27, 2010 |
| Dana Levenson | Performance Consultant, Dale Carnegie Systems | January 18, 2012 |
| Marc Levinson | Author | March 13, 2012 |
| David Levy | COO, Verdi Consulting | March 27, 2012 |
| Chuck Leyh | PresidentEnterprise Bank | April 21, 2012 |
| Guangyoung Li | Assistant Professor, Department of Electrical and, Swanson School of Engineering - University of Pitt | December 19, 2011 |
| Greg Lignelli | Chief Operating OfficerSystem One | |
| Robert Litan | VP of Research and Policy, Ewing Marion Kauffman Foundation | June 11, 2012 |
| John Logsdon | Associate Professor of Biology, University of Iowa | November 18, 2011 |
| Seth & Zac Longaker | Co-Owners, Oddball Shoes | March 16, 2012 |
| Bob Longo | President, SchoolOne | June 16, 2012 |
| Mitch Lowe | CEO, Redbox DVD Remote Distribution System | |
| Bill Lucas | Chief Development Officer, Junior Achievement | June 1, 2012 |
| Ray Lucia | Nationally Syndicated Radio Host | May 20, 2011 |
| Richard Lunak | President and CEO, Innovation Works | May 21, 2012 |
| John Lusk | Author, MouseDriver Chronicles | |
| Mark Luttner | Managing Partner, Iron Bridge Financial | June 6, 2012 |
| Bob Lutz | Former Board Chair, General Motors | August 26, 2011 |