What company based in Michigan did Richard Marvin's father co-create?
Amway Amway (short for "American Way") is an American company specializing in the use of multi-level marketing to sell health, beauty, and home care products. The company was founded in 1959 by Jay Van Andel and Richard DeVos and is based in Ada, Michigan.
Shelby Gem Factory The Shelby Gem Factory is a Michigan company that manufactures artificial gemstones through proprietary processes. The factory makes more varieties of man-made gemstones than any other in the world. It grows artificial gems and gem simulants, including synthetic ruby and simulated diamonds, citrine, topaz, and other birthstone substitutes, and mounts them in gold or silver jewelry.