Uko Zylstra is Professor Emeritus of Biology at Calvin University in Grand Rapids, Michigan. He taught at Calvin from 1976-2012. He entered college planning to prepare for the ministry, but while there felt called instead to "preach biology." He holds a PhD. from the Free University in Amsterdam in zoology. His primary areas of research include cell biology and electron microscopy, environmental issues, particularly as they pertain to environmental dimensions of world hunger, and issues in the philosophy of biology. Uko, and his wife, Jane, have four children and thirteen delightful grandchildren scattered around the United States and Australia.