Effects of and Influences on Transformational Leadership Development By MARTINA MÖNNINGHOFF born in Muenster (Northrhine-Westphalia), Germany A Dissertation submitted to the Department of Philosophy, Westfälische Wilhelms Universität Münster, Germany, in partial fulfillment of the requirements for the degree of Doctor of Philosophy August 2008 Department of Psychology Westfälische Wilhelms Universität Münster, Germany Prof. Dr. Wolfgang Hell PD. Dr. Jens Rowold Copyright © 2008 Martina Mönninghoff All Rights Reserved Tag der mündlichen Prüfung: 13.10.2008 Dekan: Prof. Dr. Dr. Richard Woyke Referent: Prof. Dr. Wolfgang Hell Korreferent: PD Dr. Jens Rowold ACKNOWLEDGEMENTS Several people deserve my thanking. Thanks to my professors Prof. Dr. Wolfgang Hell and PD Dr. Jens Rowold for their support. Jens Rowold convinced me to achieve the doctor’s degree. Thank you so much for your vision, your enthusiasm and belief in me while I researched on transformational leadership. Furthermore, huge thanks for your time and your advices. Working with you was intellectually stimulating! Special thanks to Carolin Brandes for her leadership and her individualized consideration. I am so thankful for your steady support. Thanks for your trust in my abilities. I really love to work with you! And, of course, huge thanks must go to Mr. Karsten Wulf and all his wonderful staff.