International RO History Contributors
Ken Craddock - United States
Paul Holmström - Sweden
Maria Raquel Popovich - Esp - Argentina
Harald Solaas (deceased) - Argentina
Paul Tremlett - Canada

Success Story Contributors
Charlotte Bygrave
E. Forrest Christian
Steve Clement
Elliott Jaques
Nancy R. Lee
Glenn Mehltretter
April Taggart
Paul Tremlett
John Young

Book, Article & Thesis Contributors
Alan Bacon
Brian Beiles
David Billis
David M. Boals
Anders Borg
Wilfred Brown
John Bryan
Catherine Burke
Niels Busch-Jensen
Stephen Cang
Ken Craddock
Jerry Harvey
Luc Hoebeke
Edna Homa Hunt
T. Owen Jacobs
Elliott Jaques
Pablo Kanterewicz - Esp
Mariana Karesky
Janet Kelly
Herb Koplowitz
Sandra West King
Tarald O. Kvalseth
Harry Levinson
Ian Macdonald
Judith McMorland
Glenn Mehltretter
Euan Munro
John Øvretveit
Alan Pearson
Larry Phillips
Maria R. Popovich - Esp
Roy Martin Richards Jr.
Alexander Ross (deceased)
Sheila Rossan
Ralph Rowbottom
Sarah Smart
Daniel L. Smith
Harald Solaas (deceased)
Gillian P. Stamp
Judy Steed
Karl W. Stewart
Allen Sykes
April Taggart
Paul Tremlett
Mark Van Clieaf
Edward Waitzer
Grace A. Westcott
John Young

Video Interviewees
David Billis
Jack Brady
Sir Roderick Carnegie
Leigh Clifford
Jack Fallow
Peter Forrester
Judy Hobrough
Bill Jeffery
Mark Kaminski
Warren Kinston
Ian Macdonald
Art Mann
Rick Oppenheimer
Larry Phillips
Ralph Rowbottom
Allen Sykes
Paul Tremlett
Bob Tongate
Jos Wintermans

CEO Dinner Guests
Tom Baxter
Christine Croucher
Mark Cutifani
Tim Hart
Ruth Hubbard
Sean Jackson
Lisa Lechowicz
James Lopez
Jim Maranda
Robert Pearce
W. Joseph Privott
Thad Simons
Larry Tapp (deceased)
George Weber
Jos Wintermans

Major organizations and consulting firms that provide Requisite Organization-based services

A global association of academics, managers, and consultants that focuses on spreading RO implementation practices and encouraging their use
Dr. Gerry Kraines, the firms principal, combines Harry Levinson's leadership frameworks with Elliott Jaques's Requisite Organization. He worked closely with Jaques over many years, has trained more managers in these methods than anyone else in the field, and has developed a comprehensive RO-based software for client firms.
Founded as an assessment consultancy using Jaques's CIP methods, the US-based firm expanded to talent pool design and management, and managerial leadership practice-based work processes
Former RO-experienced CEO, Ron Harding, provides coaching to CEOs of start-ups and small and medium-size companies that are exploring their own use of RO concepts.  His role is limited, temporary and coordinated with the RO-based consultant working with the organization
Ron Capelle is unique in his multiple professional certifications, his implementation of RO concepts through well designed organization development methods, and his research documenting the effectiveness of his firm's interventions
A Toronto requisite organization-based consultancy with a wide range of executive coaching, training, organization design and development services.
A Sweden-based consultancy, Enhancer practices time-span based analysis, executive assessment, and provides due diligence diagnosis to investors on acquisitions.
Founded by Gillian Stamp, one of Jaques's colleagues at Brunel, the firm modified Jaques;s work-levels, developed the Career Path Appreciation method, and has grown to several hundred certified assessors in aligned consulting firms world-wide recently expanding to include organization design
Requisite Organization International Institute distributes Elliott Jaques's books, papers, and videos and provides RO-based training to client organizations