I. John Hesselink

Ira John Hesselink Jr. (March 21, 1928 – October 28, 2018) was an American theologian. He was born in Grand Rapids, Michigan. He was a Professor Emeritus of Systematic Theology at Western Theological Seminary in Holland, Michigan. After his retirement, he was an honorary professor and continued to write a few books on John Calvin and lectures in Europe, South Korea and Japan. 
He was a theologian who was a missionary in Japan after receiving theological education at Western Theological Seminary in Holland, Michigan. He wrote a book on Calvin's Catechism and several books and papers. In his book on Calvin in the Cambridge Theologian Series, he wrote a paper on Calvin's theology. 
He was also president of Karl Barth Society of North America founded in October 1972 in Toronto by a group of Canadian and American scholars of Karl Barth, inspired by his son Markus Barth.
Hesselink died on October 28, 2018 in Holland, Michigan at the age of 90.