An Overview of McKesson and Paragon. Originally founded in 1828 in New York City as Olcott by Charles M. Olcott, and later known as Olcott, McKesson & Co. by Charles Olcott and John McKesson in 1833, the business began as an importer and wholesaler of botanical drugs. Years later, a third partner, Daniel Robbins joined the enterprise as it grew ....