Since retiring from the foreign service, Seitz has held numerous directorships, governorships, and trusteeships. All these trusteeships were slowly returned to Japanese rule. Nevertheless, the practice of Quaker trusteeships fell into disuse by the 1830s. Charity work includes trusteeships with Variety, the Children's Charity, the Chicken Shed Theatre Company. He also questioned Zander's growing authority over individual Locals through trusteeships.