Abraham Zaleznik is the Konosuke Matsushita Professor of Leadership, Emeritus, at the Harvard Business School.

Alaina Love is co-author, with Marc Cugnon, of The Purpose Linked Organization and co-founder of Purpose Linked Consulting.

Alan Webber, a founding editor of Fast Company magazine, is an award-winning editor, author, and columnist. His most recent book is Rules of Thumb: 52 Truths for Winning at Business Without Losing Yourself.

Amy L. Fraher is a retired Navy Commander and Aviator,Director of the International Team Training Center at San Diego Miramar College. Her book Thinking Through Crises comes out Spring 2011

Amy M. Wilkinson is a senior fellow at Harvard University's Center for Business and Government and a public policy scholar at the Woodrow Wilson Center. Visit her < a href="www.amymwilkinson.com">website for more.

Andy Stern is president of the two-million member Service Employees International Union (SEIU), the fastest-growing union in North America.

Angel Cabrera is President of the Thunderbird School of Global Management and Senior Advisor to the United Nations Global Compact on academic affairs. He blogs at Global Leaders Can Be Made.

Barbara Kellerman is on the faculty of at the Harvard Kennedy School and the author, most recently, of Bad Leadership: What It Is, How It Happens, and Why It Matters and Followership: How Followers are Creating Change and Changing Leaders.

Barry Posner is Dean of the Leavey School of Business and Professor of Leadership at Santa Clara University.

Barry Salzberg is CEO of Deloitte, LLP. He also is a member of Deloitte’s U.S. Board of Directors, the Deloitte Touche Tohmatsu Global Executive Committee, and the DTT Global Board of Directors.

Ben Bradlee is vice-president and former executive editor of The Washington Post. Steve Pearlstein is The Post's Pulitzer Prize-winning business and economics columnist.

Business ethics expert; senior fellow at Harvard’s schools of law and government; former General Counsel for General Electric; former assistant secretary for policy at the U.S. Department of Health, Education and Welfare (now Health and Human Services.)

Beth A. Brooke is Global Vice Chair of Public Policy, Sustainability and Stakeholder Engagement at Ernst & Young and is a member of the firm’s Global Management Group and a member of its Americas Executive Board.

Bill George is a management professor at the Harvard Business School, the former Chairman and CEO of Medtronic, Inc., and the author of several best-selling books on leadership. His latest release is 7 Lessons for
Leading in Crisis.

Bill Shore is founder and executive director of Share Our Strength, the nation’s leading organization working to end childhood hunger in America.

The former CEO of Buford Television, Inc. and current chair of The Drucker Institute, Bob Buford has founded two faith-based organizations -- Halftime and The Leadership Network -- in addition to writing several best-selling books.

Captain Bob Schoultz (U.S. Navy, Ret.) directs the Master of Science in Global Leadership at the University of San Diego's School of Business Administration.

Brad Anderson is vice chairman and CEO of Best Buy, North America’s leading consumer electronics company.

Carol Kinsey Goman is an executive coach, author and keynote speaker. Her latest book, The Nonverbal Advantage, will be followed by "The Silent Language of Leaders," to be published in April by Jossey-Bass.

Charles O'Reilly directs the Center for Leadership Development and Research at Stanford's Graduate School of Business, where he is a professor of management.

A former Teach for America corps member, Chris Myers Asch is Executive Director of the U.S. Public Service Academy and he is the coordinator for the proposed National Center for Urban Education at the University of the District of Columbia.

Cindy S. Moelis is the Director of the President’s Commission on White House Fellowships; prior to joining the Obama Administration, Cindy worked to improve public education and promoted youth development in Chicago.

Clarence Otis is Chairman and CEO of Darden Restaurants, the world's largest full-service restaurant company, with 180,000 employees and sales of more than $6.5 billion.

Colonel Charles D. Allen (U.S. Army, Ret.) is the Professor of Cultural Science in the Department of Command, Leadership, and Management at the U.S. Army War College.

Colonel Mike Haith (U.S. Army, Retired) currently works for the Army at Ft. Monroe as a Human Dimension Integrator.

The graduate students contributing here are members of "Leadership Development" at course at Teacher's College, Columbia University, taught by On Leadership panelist Todd Henshaw.

As part of the Coro Fellows Program in Public Affairs, these fellows are engaged in a full-time, nine-month, graduate-level leadership training program that prepares individuals for public-affairs leadership.

D. Michael Lindsay is a sociologist at Rice University and the author of Surveying America’s Leadership: A Study of the White House Fellows. He is also author of the acclaimed 2007 study, Faith in the Halls of Power: How Evangelicals Joined the American Elite.

Daisy Wademan Dowling, executive director of leadership development at a Fortune 500 company, writes a regular column for the Harvard Business Review and is author of the 2004 book, "Remember Who You Are."

David Flynn is president and chief technology officer of Fusion-io, a leading provider of solid-state technology and high-performance I/O solutions.

Former Comptroller General of the United States, David Walker is founder and CEO of the Comeback America Initiative.

Deborah Ancona is the Seley Distinguished Professor of Management at the MIT Sloan School of Management and the Faculty Director of the MIT Leadership Center.

Deborah M. Kolb is Deloitte Ellen Gabriel Professor for Women and Leadership at the Simmons School of Management and author, most recently, of Her Place at the Table: A Woman's Guide to Negotiating the Five Challenges to Leadership Success.

Denis A. Cortese, M.D., is President and CEO of the Mayo Clinic.

A retired U.S. Army Major, Don Vandergriff is a teacher, writer and lecturer who specializes in leadership education and training, and the future of warfare.

Donald F. Kettl is dean of the School of Public Policy at the University of Maryland and the author of many books, including The Next Government of the United States and Leadership at the Fed.

A former aviation-safety reporter and washingtonpost.com executive editor, Doug Feaver now writes the dot.comments blog.

Doug Guthrie is an expert in the fields of management, economic reform in China, leadership and corporate governance, and dean of the School of Business at George Washington University.

A former state legislator and gubernatorial aide, Ed O’Malley is President and CEO of the Kansas Leadership Center, a first-of-its-kind training center charged with fostering large-scale civic leadership for healthier communities. He tweets at eomalley.

Ed Ruggero, author most recently of The First Men In, helps organizations develop the kinds of leaders people want to follow. His Gettysburg Leadership Experience teaches battle-tested leadership lessons that endure today.

Assistant professor of American Politics at American University; founder and former director of the Center for Women in Politics and Public Policy at the University of Massachusetts, Boston.

Erika James is the Bank of America Associate Research Professor of Business Administration at UVA's Darden School and co-author of the 2010 book, Leading Under Pressure.

Former CEO of the Girl Scouts of the USA, Frances Hesselbein is the Chairman of the Board of Governors of the Leader to Leader Institute and was the Founding President of the Peter F. Drucker Foundation.

Gail S. Williams directs the Leadership Alchemy Program at the NASA Goddard Space Flight Center.

A retired U.S. Army Major General, John Batiste is president of Klein Steel Services, Inc, based in Rochester, New York.

A retired U.S. Army General, Montgomery Meigs has commanded U.S. and NATO forces overseas and is now President and CEO of Business Executives for National Security.

Geoff Colvin is a senior editor-at-large of Fortune Magazine and the author of Talent Is Overrated: What Really Separates World-Class Performers from Everybody Else.

George Daly is Dean of the McDonough School of Business at Georgetown University. An accomplished scholar, he also has taught courses on leadership and economics.

A retired U.S. Army Colonel, George Reed is an associate professor in the Department of Leadership Studies within the School of Leadership and Education Sciences at the University of San Diego.

Howard Gardner is the Hobbs Professor of Cognition and Education at the Harvard Graduate School of Education and Senior Director of Harvard Project Zero.

Ian Bremmer is author of The Fat Tail: The Power of Political Knowledge for Strategic Investing (with Preston Keat) and president of Eurasia Group, the global political risk consulting firm.

Jack LeCuyer, a retired U.S. Army colonel and a former White House Fellow, is Executive Director of the White House Fellows Foundation and Association.

Jeanne M. Liedtka is a faculty member at the University of Virginia's Darden School of Business and co-author of The Catalyst: How YOU Can Become an Extraordinary Growth Leader.

Jeffrey Pfeffer is the Thomas D. Dee II Professor of Organizational Behavior at the Graduate School of Business, Stanford University, and author of the Sept. 2010 book, POWER: Why Some People Have it and Others Don’t.

Jim Kouzes is the Dean’s Executive Professor of Leadership, Leavey School of Business, Santa Clara University, and the coauthor with Barry Posner of the internationally award-winning and best-selling book, The Leadership Challenge.

Joanne Ciulla is Professor and Coston Family Chair in Leadership and Ethics at the Jepson School of Leadership Studies, University of Richmond, the only undergraduate degree-granting school of leadership studies in the world.

John Baldoni is a leadership consultant, coach, and regular contributor to the Harvard Business Review online. His most recent book is Lead Your Boss: The Subtle Art of Managing Up.

Executive Director of The Permanente Federation, the national umbrella organization for the regional Permanente Medical Groups, which employ 15,000 physicians who care for 8.6 million Kaiser Permanente members.

John R. Ryan is president of the nonprofit Center for Creative Leadership, a top-ranked, global provider of executive education.

Jonathan Cowan is president and co-founder of Third Way, a think-tank of the progressive movement. In the Clinton administration, he served as Chief of Staff of the U.S. Department of Housing and Urban Development.

Juana Bordas is president of Mestiza Leadership International, a company focusing on leadership, diversity, and organizational change. Author of the 2007 book Salsa, Soul, and Spirit: Leadership for a Multicultural Age, she is a board member of the International Leadership Association.

Karyl B. Leggio, Ph.D., is dean of Loyola University Maryland’s Sellinger School of Business and Management.

Katherine Tyler Scott is Managing Partner of Ki ThoughtBridge, a leadership consultancy, and is author, most recently, of Transforming Leadership: The Episcopal Church of the 21st Century. She is a board member of the International Leadership Association.

Kathryn Kolbert, a public-interest attorney and journalist, is the Director of the Athena Center for Leadership Studies at Barnard College, an interdisciplinary center devoted to the theory and practice of women's leadership.

Kathy Postel Kretman is the Director of Georgetown University’s Center for Public and Nonprofit Leadership, where she leads the University’s nationally-recognized Nonprofit Management Executive Certificate Program.

A Reagan-era Ambassador and Arms Control Director, Ken Adelman is co-founder and vice-president of Movers and Shakespeares, which offers executive training and leadership development.

Kent Thiry is Chairman and CEO of DaVita Inc., the largest independent provider of dialysis services in the US.

A former mayor of Baltimore City, Kurt Schmoke is Dean of Howard University School of Law.

Lillian Cunningham is the editor of On Leadership at the Washington Post.

Lisa Caputo is Executive Vice President and Chief Marketing Officer at Citi. She is also Chairman and Chief Executive Officer of Citi’s Women & Co.

Lisa Larson is the Founder and President of Larson & Partners, LLC. When she is not helping companies optimize the business results delivered from their IT projects, she can be found watching football.

Todd Henshaw is currently the director of executive leadership programs at Wharton. Previously, he directed the leadership program at the U.S. Military Academy at West Point.

Marie C. Wilson is founder and president emeritus of The White House Project, co-creator of Take Our Daughters and Sons to Work ® Day and author of Closing the Leadership Gap: Why Women Can and Must Help Run the World.

Marshall Goldsmith is an executive educator, speaker, coach and best-selling author. His most recent book is Mojo.

Dr. Martin Davidson is Associate Professor of Leadership and Organizational Behavior at the University of Virginia’s Darden School of Business where he also serves as Associate Dean and Chief Diversity Officer. He blogs at Leveraging Difference.

Co-founder of the leadership-focused consulting firm, Cambridge Leadership Associates, Marty Linsky teaches at the Harvard Kennedy School, co-authors the advice column, Leadership House Call and blogs at Linsky on Leadership .

A member of the President's Advisory Committee in Rwanda, Michael Fairbanks is co-founder of The SEVEN Fund, a philanthropic foundation run by entrepreneurs. His most recent book is In the River They Swim: Essays from Around the World on Enterprise Solutions to Poverty.

Michael Maccoby is an anthropologist and psychoanalyst globally recognized as an expert on leadership. He is the author of The Leaders We Need, And What Makes Us Follow.

Michael Useem is Professor of Management and Director of the Center for Leadership and Change Management at the Wharton School of the University of Pennsylvania.

Former U.S. Congressman, Mickey Edwards is vice president of the Aspen Institute, where he directs the Institute's Rodel Fellowships in Public Leadership.

Nancy F. Koehn is a historian at the Harvard Business School and author, most recently, of The Story of American Business: From the Pages of the New York Times.

Noel M. Tichy is a Professor of Management & Organizations at the Ross School of Business at the University of Michigan, where he directs the Global Business Partnership.

A former president of the Boy Scouts of America and chair of the American Red Cross, Norm Augustine is the retired Chairman and CEO of Lockheed Martin Corporation.

On Leadership publishes a weekly video series with prominent national and international leaders. Complete archives available here.

A Senior Fellow at the Georgetown Public Policy Institute, Pablo Eisenberg served for 23 years as Executive Director of the Center for Community Change.

Former President and CEO of The Council for Excellence in Government, McGinnis teaches leadership at Georgetown University's Public Policy Institute and advises the White House on leadership programs for presidential appointees.

Paul H. O’Neill served as the 72nd Secretary of the U.S. Treasury from 2001 to 2002, as well as chairman and CEO of Alcoa, Inc.

Paul R. Portney is Dean of the Eller College of Management at the University of Arizona, where he also holds the Halle Chair in Leadership.

Paul Schmitz is CEO of Public Allies, which, through AmeriCorps and other programs, identifies and prepares young community and non-profit leaders.

Peter Hart is chairman of Hart Research, a firm that does the public opinion polling for NBC/Wall Street Journal.

As CEO of Sage Associates, Ambassador Prudence Bushnell lectures and consults on international and leadership topics.

Raju Narisetti, a Managing Editor at The Washington Post, is a former founding editor of Mint, a business newspaper in India. Previously, he blogged as A Romantic Realist.

This post is written by students in Professor Michael Lindsay's leadership course at Rice University.

A former governor and director of the Peace Corps, Ambassador Richard Celeste is President of Colorado College.

For the past 22 years, Rick Rochelle has taught leadership skills on remote wilderness expeditions around the world for the National Outdoor Leadership School (NOLS). Currently he directs the school's custom course division, NOLS Professional Training.

Robert F. Bruner is the Dean of the Darden School of Business, University of Virginia, and author of a blog and several books, including The Panic of 1907: Lessons Learned from the Market's Perfect Storm.

Robert J. Goodwin is CEO and co-founder of Executives Without Borders; former deputy assistant secretary of the Air Force and appointee at USAID, the State Department and the White House.

Roger Martin is Dean of the Rotman School of Management at the University of Toronto and author, most recently, of The Design of Business. His website is www.rogerlmartin.com

Roger M. Porter, a former White House Fellow and Director of the White House Office of Policy Development under Ronald Reagan, is IBM Professor of Business and Government at the Kennedy School of Government at Harvard University.

Ronald Heifetz, the founding director of the Center for Public Leadership, is the King Hussein bin Talal Senior Lecturer in Public Leadership at Harvard Kennedy School and a Principal at Cambridge Leadership Associates.

Sally Blount is dean of the Kellogg School of Management at Northwestern University. An internationally recognized expert in the fields of negotiation and behavioral decision-making, she has more than 20 years of experience in higher education.

Scott DeRue is Assistant Professor of Management and Organizations at the University of Michigan Stephen M. Ross School of Business. With Maxim Sytch, he created the student-driven Leadership Seminar discussion group.

A retired U.S. Army Colonel, Scott Snook is Associate Professor of Organizational Behavior and Tukman Faculty Fellow at the Harvard Business School.

Selena Rezvani is author of the new book, The Next Generation of Women Leaders: What You Need to Lead but Won't Learn in Business School and co-president of Women's Roadmap. Follow her on Twitter at @NextGenWomen.

Seth Goldman co-founded Honest Tea in 1998 with Barry Nalebuff, his professor at the Yale School of Management. The Bethesda, Md.-based company has been continuously recognized for its growth and business practices.

Sharon Meers is co-author of Getting to 50/50: How working couples can have it all by sharing it all. A former managing director at Goldman Sachs, she now works in Silicon Valley.

Professor Sir Andrew Likierman is Dean of London Business School. He is also non-executive Chairman of the National Audit Office and a non-executive Director of Barclays Bank plc.

A former U.S. Senator and Washington State Attorney General, Slade Gorton served on the 9/11 Commission.

Steve is The Washington Post's Pulitzer Prize-winning business and economics columnist. Raju is a managing editor at The Washington Post.

Steve Pearlstein is a Pulitzer Prize-winning business and economics columnist for The Washington Post and co-host of washingtonpost.com's "On Leadership" forum.

Susan Peters is the vice president of executive development and the chief learning officer at GE.

Former Vice Chairman of The Goldman Sachs Group, Inc., Suzanne Nora Johnson chairs the Global Agenda Council on Systemic Financial Risk at the World Economic Forum.

A military psychologist, T. Owen Jacobs is co-founder and principal of Executive Development Associates, an Oklahoma City-based leadership consultancy.

Thomas S. Bateman is the Bank of America Professor in the McIntire School of Commerce at the University of Virginia.

Thomas L. Monahan III is the Chairman and CEO of Corporate Executive Board, a leading provider of best-practices research, data, and tools to more than 120,000 executives and organizations, including 80% of the Fortune 500 and 70% of the FT 100.

The Art and Adventure of Leadership is an upper-division leadership seminar taught each spring by University of Southern California President Steven B. Sample and Professor Warren Bennis.

Walter Ulmer, a retired U.S. Army Lieutenant General, consults on executive leadership and the management of complex organizations.

Warren Bennis is University Professor and Distinguished Professor of Business at the University of Southern California. His newest book is 'Still Surprised: A Memoir of a Life in Leadership.'

A group of 13 cadets and four instructors from the U.S. Military Academy at West Point take on the weekly 'On Leadership' questions. Who better to explore the gray areas of leadership than members of The Long Gray Line?

Founding editor of Fast Company and co-author of Mavericks at Work, William C. Taylor is working on his next book, Practically Radical. Follow him on Twitter @practicallyrad

Yash Gupta is Professor and Dean of The Johns Hopkins Carey Business School.