Who is William Duiker?
This question is almost certainly referencing the historian William J. Duiker. He is an expert on Far Eastern history and diplomatic affairs as well as globalization, and his most famous book is a biography of Ho Chi Minh, notable because it was the first biography of the Vietnamese leader written using documents from Vietnamese archives. A summary of this work can be founded on eNotes, linked in the sources section below. He has also, along with Jackson Spielvogel, published a world history textbook that is used in many AP and college world history classrooms. He is currently a professor at Penn State University.
The earliest register of William Duiker shows an immigrant from the Netherlands, born in 1843. He immigrated to the United States (Michigan). Marriage records show that he married Elena De Haas in 1870.
Another record of William Duiker shows an 1878 birth in Holland and an immigration to New York City in 1915.
Another William Duiker, born again in Holland in 1878, immigrated to Iowa.
One final Duiker is shown as being born in Wales (as of the 1891 census).
Many other William Duikers are shown as being born in and residing in Michigan (around 8-10 in total).