Instructors & Contacts

Meet Your Professor(s)

Randall J. Vos

Randall J. Vos

Program Chair
515-965-7310, FAX: 515-965-7135

​Randall Vos started teaching at DMACC in 2007 and is a Professor in addition to serving as the Horticulture Department Program Chair. Randall teaches a wide range of horticulture courses, but his main teaching focus is with courses relating to soil, greenhouse production and food crop production. Prior to working at DMACC, Randall was a greenhouse production manager and worked in fruit crop and fertilizer research.​​​


  • B.S. Agriculture Plant Science - Dordt College
  • M.S. Horticulture - Michigan State University
  • ​Ph.D. Horticulture - Iowa State University​


  • Fertilizer research
  • Greenhouse production manager
  • Graduate research assistantship in viticulture
  • Floriculture internship in The Netherlands
Jim Mason

Jim Mason

515-964-6828, FAX: 515-965-7135


  • B.S. Landscape Architecture - Iowa State University


  • Owner of Country Landscapes, Inc. in Ames for 35 years
  • Adjunct in DMACC Horticulture for 6 years prior to full-time faculty
  • Past president of both Iowa Nursery and Landscape Association and Western Nursery and Landscape Association

​Program Contacts

Caitlyn Zimmerman

Pathway Navigator


Christa Grove
Academic Advisor