Greg Sadler is the president of ReasonIO, adjunct professor of philosophy and humanities at the Milwaukee Institute of Art and Design, and the co-host of the Wisdom for Life radio show. His popular YouTube channel has nearly 3,000 videos, and has drawn 14 million total views. He is a member of the Modern Stoicism team, and edited Stoicism Today from 2016-2022. He recently finished the Half Hour Hegel project, providing line-by-line commentary on the Phenomenology of Spirit.

After serving in the US Army as a combat engineer, Greg earned a B.A. in mathematics and philosophy from Lakeland University, then his M.A. and Ph.D. in philosophy from Southern Illinois University Carbondale. He has been a faculty fellow at Notre Dame University’ Erasmus Institute, a visiting scholar at the European Graduate School, a Charles Chesnutt Library fellow, and recently completed the LEAP Institute for non-profit leaders at the Kacmarcik Center for Human Performance.
His publications include one book, two edited volumes, dozens of academic articles, book chapters, and encyclopedia entries, and numerous pieces written for popular audiences.

His philosophical counseling and consulting work focuses on the emotions, ethics, leadership, and specifically on anger management. His past and present clients include corporate executives and leaders, CEOs of smaller and start-up companies, psychotherapists, psychologists, medical professionals, professors, lifelong learners, and students.