Murphy is a political science prof in New Jersey and has written a new bio of William Penn. I suspect this Aeon post is a bit of sponsored content to promote the book but it’s still worth a read:
Penn was a man of paradoxical qualities. He espoused a radically egalitarian Quaker theology, insisting that something divine resided within each individual, yet he owned slaves on his American estate. He praised representative institutions such as parliament and the jury system, but spent years in hiding for his loyalty to an absolutist king. ‘I am like to be an adopted American,’ he wrote shortly after arriving in Pennsylvania in 1682, but spent only four of his remaining 36 years there. And he was chronically incapable of managing money, spending eight months in an English debtors’ prison in his 60s, even while his colony quickly became a commercial success.
https://aeon.co/ideas/hes-not-the-guy-on-quaker-oats-hes-much-more-interesting