What Did UPS' Jim Casey Do For The Mail? Plenty - Investors Business Daily Jim Casey may be the most important corporate figure you've never heard of. From humble beginnings, he built a tiny messenger company in the early 1900s into the world's biggest package delivery company, United Parcel Service (UPS). Synonymous with the brown of its vehicles and uniforms — hence the ad campaign "What can brown do for you?" — UPS employs 400,000 to generate big numbers: $50 billion in sales last year while shipping nearly 4 billion packages and documents.