Meet the Team
History Highlights
Grower Resources
Diamond Online
Did You Know?
  • Harvest begins in September for walnuts
  • More walnuts are processed at Diamond than any other place in the world
  • Spanish missionaries brought walnuts and almonds to the U.S. in the 18th Century

Meet the Team

Grower Services Department

Diamond is the only processor with full-time field and Grower Services office staffs. These men and women have decades of experience gained working for Diamond and other agriculture-oriented companies. Our expert field representatives live and work in the growing areas and are ready to answer questions on topics ranging from cultural practices to marketing. The team is fully accessible, and grower-owners can reach Diamond’s Grower Services Department by dialing direct, toll-free or online.

Contact Our Grower Services Department


Office 209-932-5665
Toll free # 800-355-3346

Grower Relations & Corporate Affairs


Sam Keiper

Sam Keiper

Vice President of Corporate Affairs
Office: 209-467-6232
Toll-free: 800-692-3400
skeiper@diamondnuts.com

Plant Managers & Field Reps


Eric Heidman

Eric Heidman

Director of Field Operations
Cell Phone: 209-483-3615
Office: 209-467-6202
eheidman@diamondnuts.com

Gene Manhire

Gene Manhire

Sequoia Plant Manager/Field Rep for Kern, Tulare, Fresno, Kings, Madera & Merced Counties; Paso Robles, San Jose & Solvang areas
Cell Phone: 559-730-1959
Office Phone: 559-734-3367
gmanhire@diamondnuts.com

 

Justin Bream

Grower Services Manager for San Joaquin, Stanislaus, Merced and Contra Costa counties
Cell Phone: 209-351-2363
Fax: 209-933-6874
jbream@diamondfoods.com

Dan Newman

Dan Newman

Grower Services Manager
Sacramento Valley and North Coast
Cell 530-218-2612
dnewman@dimaondfoods.com

Grower Services


Jessica Dunlap

Jessica Dunlap

Grower Services Supervisor
Office: 209-932-5665
Toll-Free: 800-355-3346
jdunlap@diamondfoods.com