R.J. Lewis, Founder and CEO and Don Langsdorf, Director of Digital Solutions & Strategy at eHealthcare Solutions interview John Mack, a.k.a. Pharmaguy, the founder of the Pharma Marketing Network.   John shares some of his favorite moments from his 20 years as a highly visible and respected maverick in the pharmaceutical and healthcare marketing world. eHealthcare Solutions took over the Pharma Marketing Network from John in 2018, following his retirement, and relaunched pharma-mkting.com in March of 2019.