Who is the gsi company? The GSI Company is a manufacturer's representative company established in 1979 with over 75 years of combined experience. We specialize as a solutions provider for food, agriculture, plastics, minerals, chemicals, pharmaceuticals, and other process industries.What is the email address of gsis philippines? New Email Address: [email protected]. GSIS CALL CENTER NUMBERS: For Calls within Metro Manila: (02) 8-847-4747. For International Calls: (632) 8-847-4747. For Provincial Calls: 1-800-8-847-4747 (for Globe subscribers) or 1-800-10-8474747 (for Smart subscribers) Government Service Insurance System Financial Center Pasay City Metro ManilaHow do i contact the gs1 office? United States Phone: + 1 937 435 3870 Website: www.gs1us.org Email: [email protected] What does gsi mean to you? “For the farmers. For the people working for them. For ourselves. For the future.” Integrated grain systems protecting yield and marketing flexibility including grain storage, conditioning, material handling and structures: This is GSI.