Mr. Tengwall is a visiting professor in the Department of Business & Economics, where he engages students on a range of topics including Management & Leadership, Business Models & Growth Strategy, Sales & Marketing, and Supply Chain/Operations Management. He also serves on the Boards of two companies and provides management consulting services to a range of businesses.

Previously, Mr. Tengwall had a 12-year career with the Marmon Group, a Berkshire Hathaway Company. During this time he was President of EcoWater Systems LLC (2019 – 2024), a leading North American manufacturer and marketer of residential and light commercial water softening and filtration systems. Prior to that, he was president of Marmon Food & Beverage Solutions Group (2013 – 2019), which was comprised of two different businesses, Marmon Link and Marmon Renew. Marmon Link (previous dba 3Wire Group Inc) is a provider of parts, training and service for foodservice and beverage dispensing equipment. Marmon Renew is a re-manufacturer of commercial beverage dispensing and related foodservice equipment.

Prior to his executive leadership roles with Marmon/Berkshire Hathaway, he had a 17-year career with Ecolab (NYSE: ECL). There he held several progressively more responsible leadership roles in the Institutional and Food & Beverage operating divisions. He led the marketing function for both business segments and engaged in multiple acquisitions as part of the overall business growth strategy.

Mr. Tengwall began his career as a microbiologist in the Sterilization Technology & Process Control Validation group at The Upjohn Company (now Pfizer). He then pivoted into marketing and business development roles with IMI Cornelius Inc., a subsidiary (at the time) of IMI plc.

John C. Volin, PhD serves as the 18th President of Gustavus. 

Following a postdoctoral fellowship in plant physiological ecology at the University of Wisconsin-Madison, Volin accepted a faculty position at Florida Atlantic University, where he rose to the rank of full professor in the Department of Biological Sciences and served as the director of the Environmental Sciences graduate program. Volin joined the University of Connecticut in 2007 to head the Department of Natural Resources and the Environment, advancing to serve as Vice Provost of Academic Affairs. From 2020-2025, Volin served as the Executive Vice President for Academic Affairs and Provost at the University of Maine, where his portfolio included oversight of more than 1,000 faculty and staff and a budget of over $250 million. Volin is recognized as a national leader in using evidence-based practices to support holistic student wellbeing. He serves on the Executive Committee of the LearningWell Coalition and is a co-founder and senior advisor of LearningWell magazine.

Born and raised in Sioux Falls, South Dakota, Volin holds a BS in botany and biology and an MS in agronomy from the South Dakota State University, and a PhD in forestry from the University of Wisconsin-Madison. Volin and his wife, Valeria, have five children and six grandchildren.

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