SSJID - Key Persons


Dave Kamper

Job Titles:
  • Member of the Board of Directors
  • Division

David Roos

Job Titles:
  • Member of the Board of Directors
  • Division
Background: After graduating Ripon Christian in 1989, Mr. Roos attained his Class A trucking license and returned to work on the family farm. He spent three months in the Australian Outback farming almonds and tomatoes, and later joined Ripon Farm Service which then transitioned into Wilbur Ellis. Mr. Roos is a third-generation farmer who helped to build the Highland Roos Ranch, which was later sold in 2001 and renamed in 2019 to Highland Ag. Mr. Roos currently works for Highland Ag driving truck during almond harvest, and currently farms his own almonds. He resides in Escalon with his wife, two children, and his adored white Poodle, Minnie. Hobbies: Coin collecting, golfing, deep sea fishing

Glenn Spyksma

Job Titles:
  • Member of the Board of Directors
  • Division
  • Retired Executive Vice President of the Wine Group
Background: Mr. Spyksma is a retired Executive Vice President of The Wine Group, and has 37 years of management and engineering experience in the food processing industry. He holds a degree in Mechanical Engineering from Sacramento State. Hobbies: Farming almonds, restoring classic cars, reading, snow skiing, fly fishing, and cycling.

Joe Hasten

Job Titles:
  • Irrigation Services Supervisor

John Holbrook

Job Titles:
  • Member of the Board of Directors
  • Division

Jonnie Moore

Job Titles:
  • Field Maintenance Supervisor

Mike Weststeyn - President

Job Titles:
  • Member of the Board of Directors
  • President
  • Division