Go back to directory. Add to Address Book. Mr. Jeff Seehafer Algebra Teacher Jr./Sr. High School – Winthrop, MN School 302 N. Cottonwood St. PO Box 1001 Sibley Winthrop MN 55396 USApostal Work Phone: (507) 207-2276work Work Email: jeff.seehafer@gfwschools.orgINTERNET Categories: Junior/Senior High School Updated 2 months ago. Share on