David Pratt

MAST International Program Manager

David is a graduate of the University of Minnesota and has worked at MAST since 1992. He was an exchange student to Brazil and has traveled extensively within and outside the United States. He loves the interaction with trainees, host trainers and country partners. Contact David if you have questions concerning the MAST program, particularly if you are interested in becoming a host trainer or trainee.

David Pratt

Sue Riesgraf

MAST International Placement Coordinator

Sue has had several international experiences that include studying in Scotland, working in Australia and serving as a Peace Corps volunteer in Niger, West Africa. She has a passion for education and promoting cultural understanding. Sue has an extensive background in horticulture and viticulture, so contact her with questions about training or hosting opportunities, especially within these areas.


Joan Petersen

MAST International Accounts Specialist

Joan has a love for all things cultural and international, especially food, dance and theater. Contact Joan if you are a MAST trainee or host with payment questions or anything related to accounts payable and receivable.

Picture of Joan Petersen

Jennifer Adrian

MAST International Academic Program Coordinator

Jennifer is a graduate of the University of Minnesota and spent time in England, Switzerland, and Russia while she was a student. She still tries to travel as much as she can, both in the USA and internationally. Contact Jennifer if you have questions about the study program, social media and communications, or MAST program marketing. 

Jennifer Adrian

Pamela Jonkman

MAST International Program Coordinator

Pam is a former English as a Second Language (ESL) teacher and she also previously worked at the Minnesota Landscape Arboretum, where she met many MAST trainees. Pam enjoys connecting with MAST participants and country partners, learning about trainee's home countries, and talking about funny nuances of the English language. Contact Pam about orientations and the U.S. arrivals process. 

Pamela Jonkman portrait