GMP Metal Products celebrates 50th anniversary in Humboldt 'A good product with on-time delivery' Check out this story on jacksonsun.com: http://www.jacksonsun.com/story/news/2014/12/13/gmp-metal-products-celebrates-th-anniversary-humboldt/20368061/ "In Humboldt, we are dug in deep," said Michael Wozniak, president/CEO of Wozniak Industries. "We've been here for 50 years, and we have great roots."