Prof. Herman Hanko was ordained and installed into office in 1955 in the Hope Protestant Reformed Church of Walker, MI. In 1963 he accepted a call to serve in the Doon, Iowa Protestant Reformed Church. In 1965 he was appointed to serve as professor in the Protestant Reformed Seminary in Grandville, MI. He served in that capacity until his retirement in 2001. He continues to lecture widely both in the USA and in the United Kingdom as well as in other countries, including Singapore and the Philippines. He is instructor of a catechism class in Walker, MI.