Upton's Naturals

From their website:

Since 2006, Chicago-based Upton's Naturals has been committed to making delicious varieties of seitan using real, simple ingredients. A vegan-owned company, co-founder and president, Daniel Staackmann, hopes that by cooking with Upton’s Naturals, more people will see how easy it is to be vegan-and that it's not about just eating salads. (However, it's important to eat salads too!)