Philip was elected Fellow of the Royal Society on the 15th February 1665.
He married Jemima Montagu, daughter of Edward Montagu, 1st Earl of Sandwich, in an arranged marriage on 31 July 1665. Samuel Pepys had a hand in the marriage and wrote of it at some length in his diary. Jemima had only known of Philip some fourteen days before their marriage. It is noted that Jemima failed to arrive in time for the ceremony at the church.