After nine years in automotive component engineering (1988 - 1997) with Wagner Lighting, KB Lighting, Johnson Controls and Carlisle Engineered Products, Mark Corsello changed his focus to sales, and became an independent sub-representative of a Detroit-based Manufacturers' Rep Agency. After a very successful tenure of over ten years as a sales rep, Mark formed MAC Sales, LLC in 2007.

In addition to serving as Sales Representatives for various automotive and military component suppliers for nearly ten years, MAC Sales, LLC has recently taken on their own line of specialty Polyester materials suitable for various applications in a variety of markets.