From:

[coachinghistory.com]

(est/Landmark-iterations indicated in RED/


13.7% – CoachInc (includes Coach U and Corporate Coach U programs;
12.2% — Landmark Education;
7.3% – Coachville (all schools);
6.8% – Coach Training Institute (CTI);
2.8% – A Program for Coaches;
2.6% – Newfield Network;
2.2% – Abundant Life;
1.9% – College of Executive Coaching;
1.7% – 1 and 1 Coaching School;
1.4% – Coach Training Alliance;
1.2% – Hudson Institute;
1.2% – New Ventures West;
1.1% – Academy for Coach Training (ACT);
1.1% – Institute for Life Coach Training (ILCT)

The top four coach-training organizations rated most influential received their philosophical foundation from the Human Potential Movement through Leonard, Whitworth, and Erhard. (Italics, mine)








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I have indicated the programs that are est-iterations in RED. The ICF is an est-iteration, and serves now as the governance body for other est-iterations.