 He would remain there until 1904, at which time he was named the pastor of the First Dutch Reformed Church of Schenectady, New York—the city with which he would become intimately associated.Closely concerned with matters of ethics and poverty, Lunn became a Christian socialist, testifying the social gospel from the pulpit.Seeking to eliminate suffering through structural change, Lunn joined the Socialist Party of America and in 1911 he was elected Mayor of Schenectady at the head of the local Socialist ticket.