Professor Tellefsen earned his AAS in Business at CSI and his BBA in Accounting and MBA in Marketing at Baruch College – CUNY.  He spent over a decade in private industry where he worked in a variety of positions in accounting, sales, and marketing management.  Thereafter he earned his Ph.D. in Marketing at the Graduate School of the City University of New York.

At CSI, Professor Tellefsen teaches courses in marketing and management at the undergraduate and graduate levels.  He has also served as an advisor for students conducting independent studies and a mentor to CUNY baccalaureate candidates. Professor Tellefsen is also a member of the doctoral faculty of the Graduate School of the City University of New York.  In that role, he has served as a dissertation committee member for Ph.D. candidates in the doctoral program in business.


PhD, CUNY Graduate Center

MBA, Baruch College

BBA, Baruch College

AAS, College of Staten Island

Scholarship / Publications

Professor Tellefsen’s primary research interest involves business-to-business marketing. He has conducted extensive research into the role of individual boundary spanners (i.e., salespeople and purchasing managers) in building inter-organizational relationships. His other areas of research include sales management, international marketing, and Internet applications in marketing.  He has published his research in a variety of journals including: Industrial Marketing Management, the Journal of Business-to Business-Marketing, The Journal of Industrial and Business Marketing, the Journal of Marketing Channels, the Journal of Personal Selling and Sales Management, the International Journal of Internet Marketing and Advertising, the Journal of International Marketing, and Computers in Human Behavior. He has also presented his work at numerous academic conferences and served as a reviewer for several journals. He currently serves as a member of the editorial board of the Journal of Business-to-Business Marketing.