motivational theory

The following are contributors to motivational theory:
R. DeCharms

E. L. Deci

Frederick Herzberg

Abraham H. Maslow

Henry A. Murray

Edward E. Lawler, III

Ernest J. McCormick

Lyman Porter

B.F. Skinner

F.W. Taylor

Kenneth S. Teel

Victor H. Vroom
Describe their contribution to motivation theory and describe how their contributions to motivation can help you as a HR Professional.