 Stevin is listed in the University's registers until 1590 and apparently never graduated.Following William the Silent's assassination and Prince Maurice's assumption of his father's office, Stevin became the principal advisor and tutor of Prince Maurice.Prince Maurice asked his advice on many occasions, and made him a public officer – at first director of the so-called "waterstaet" (the government authority for public works, especially water management) from 1592, and later quartermaster-general of the army of the States-General.