1. I-O Psychology Family Trees An update of Frank L. Landy’s (1997) work by Jeffrey M. Cucina & Fresia Jackson (April 2016)

2. Wundt J.M. Cattell Walter D. Scott PintnerWitmer Munsterberg TitchenerArpsScripture

3. J.M. Cattell HollingsworthStrong Humphreys Ferguson Garrison Boynton McGehee E.K. Taylor G. Murphy Newcomb William Scott Hautaluoma McPhail G. Watson Buhler Kulpe Wundt

4. J.M. Cattell HenmonE.L. Thorndike Stagner Dunlap Toops Wherry Edgerton Winer Naylor Dudycha Schmitt Anderson Goldstein Bartlett Schneider Howard Farr R. Campbell K.Murphy Pulakos (co) T.L. Kelley J. Flanagan Ronan Latham Knight Remmers Rosen Kraiger Billings Cortina Reynolds Outtz Kozlowski

5. Pintner Paterson OwensDunnette J.J. Jenkins Hakel Sackett J. Campbell Arps MacKinney A.M. Ryan Hough Oswald

6. Munsterberg PresseyAllport H. Burtt Thayer Campion Shartle Fleishman Grant Doob Bray Sparks Henry Gough Hathaway Meehl Bouchard McHenry Elliott Glickman Salas

7. Witmer Otis Viteles Smith Ash Barrett Rush Allen

8. Titchener PillsburyGuilford Bentley Ferree J.G. Jenkins Boring Murchison Wallace N.R.F. Maier Meyer Vroom Ryan Tenopyr Geldard Deci Cascio Smith Ilgen Blood Zedeck Borman Hulin Bills Pulakos (co) Andrews C.M. York Tippins

9. C. Seashore Miles Stoddard Tiffin S. Seashore Guion King Lawshe Crissey Ruch Scripture Landy Klimoski H.M. Williams Kephart McCormick DeNisi Burke Bernstein Raju Birziska (Ph.D. in math) (Law degree) Master’s Ph.D.

10. W. James S. Hall Angell Moore Katzell Brown Thurstone Baxter Bingham Ghiselli Porter Fryer Terman Jastrow Tinker Miller Bennett Hull C.W. Taylor L. James Tetrick Lawler Wanous Colella

11. Munsterberg Yerkes Spence Macey Underwood Zechmeister Royce W. James McGeoch Carr J.B. Watson Dewey S. Hall M.R. Cohen Nagel Suppes Levine Drasgow