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Research Assistants

Dr. Philipp Julian Ruf

Julian Ruf
Tel.: +49 (0) 271/ 740 - 3900
Room: US-F 008
 Ruf neu

Professional Development

Bachelor of Business Administration  Netherlands / The Hague

Master of Science in Entrepreneurship and SME Management at the University of Siegen

Graduate Research Assistant SME Graduatschool Siegen

Graduate Research Assistant Chair for Entrepreneurship and Family Business

PhD in Business Administration at the University of Siegen  


Philipp-Julian Ruf studied business administration at the University of Siegen. He is a research fellow of the SME Graduate School and a senior researcher at the Chair for Service Development in SMEs and Crafts. Next to holding the Dirlmeier Award for outstanding Dissertations, he received numerous best paper awards in the field of business administration.  In his research, he focuses on values and psychological aspects, influencing the behavior of family CEOs and their impact on behavior, leadership, performance, and entrepreneurial orientation of the family firm.



04.08. – 08.08.2023 Annual Meeting of the Academy of Management (AOM), Boston, USA

14.06. – 16.06.2023 European Academy of Management (EURAM), Dublin, Ireland

05.08. – 09.08.2022 Annual Meeting of the Academy of Management (AOM), Seattle, USA

30.07. – 03.08.2021 Annual Meeting of the Academy of Management (AOM), Seattle, USA (virtual meeting)

07.08. – 11.08.2020 Annual Meeting of the Academy of Management (AOM), Vancouver, Canada (virtual meeting)

26.06. – 28.06.2019 European Academy of Management (EURAM), Lisbon, Portugal

05.06. – 08.06.2019 Babson College Entrepreneurship Research Conference (BCERC), Boston, USA 


Grözinger, A.-C., Wolff, S., Ruf, P. J.,Audretsch, D., & Moog, P. (2023) The impact of SME leader’s psychological capital on strategic responses during crisis. Business Research Quarterly. (IF: 2.9) https://doi.org/10.1177/23409444231184481

Köhn, P., Ruf, P.J., Moog, P. (2022) Why are non-family employees intrapreneurially active in family firms? A multiple case study. Journal of Family Business Strategy. (VHB: C, IF: 7.2) https://doi.org/10.1016/j.jfbs.2022.100532

Grözinger, A.-C., Wolff, S., Ruf, P. J., & Moog, P. (2021). The power of shared positivity: Organizational psychological capital and firm performance during exogenous crises. Small Business Economics. (VHB: B, IF: 6.4) https://doi.org/10.1007/s11187-021-00506-4

Ruf, P. J., Graffius M., Wolff, S., Moog, P.M., & Felden, B. (2020). Back to the Roots: Applying the Concept of Individual Human Values to Understand Family Firm Behavior. Family Business Review. (VHB: B, IF: 8.8) https://doi.org/10.1177/0894486520944282

Ruf, P. J., Moog, P. M., & Rius, I. B. (2020). Values as antecedents of socioemotional wealth behaviour in family firms. International Journal of Entrepreneurship and Small Business. (VHB: C, IF: 1.7) https://doi.org/10.1504/IJESB.2020.106944

Ruf , P. J., & Köhn, P. (2020). The life cycle of academia and its impact on early career researchers publishing behaviour. In F. Welter & D. Urbano, How to Make your Doctoral Research Relevant (pp. 106–118). Edward Elgar Publishing.  https://doi.org/10.4337/9781788977616.00023

Ruf , P. J., Meisner, K., & Moog, P. M. (2020). Ordnung muss sein: Unternehmensnachfolge in dysfunktionalen Familien. In B. Felden, A. Hack, & C. Hoon (Eds.), Fallstudien zum Management von Familienunternehmen: Teaching Cases für Lehre und praktische Anwendung (pp. 83–94). Springer Fachmedien Wiesbaden. https://doi.org/10.1007/978-3-658-27721-5_8  


2023 Förderpreis für den wissenschaftlichen Nachwuchs: Why are non-family employees intrapreneurially active in family firms? A multiple case. Study, Verein zur Förderung der Wirtschaftswissenschaftlichen Fakultäten der Universität Siegen e.V.

2023 Dissertation Förderpreis der Dirlmeier-Stiftung: How Values and Socioemotional Wealth influence Behavior and Performance in Family

Firms. Dirlmeier-Stiftung

2023 Nomination for the best paper award at the 2023 European Acadamy of Management Conference (EURAM), Family Business SIG:

Meausuring Family Influence from the Perspective of Non-family Employees: The Perceived Family Influence Scale (PFIS)

2021 Acedemy of Management (AOM) Best Paper Proceedings: The Pillars of Family Firm Performance? How Owner Manager’s Values impact SEW and Performance

2019 EURAM Best Paper of the Track Award, Family Business SIG: Back to the Roots: Applying the Concept of Individual Human Values to understand Family Firm Behavior

2017 Best Graduate Master of Entrepreneurship & SME Management summer term

Research Focus

Family Business

Values, Moral and Ethics in Family Businesses




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