- Born: 4 Mar 1871, Dalfsen, Overijssel, Netherlands
- Marriage (1): Anna Elisabeth Charlotte Horn on 24 Dec 1911 in The Hague, 's-Gravenhage, Zuid-Holland, Netherlands
- Died: 19 May 1945, Ellecom at age 74
 Noted events in his life were:
• Occupation: grafoloog letterkundige.
Willem married Anna Elisabeth Charlotte Horn on 24 Dec 1911 in The Hague, 's-Gravenhage, Zuid-Holland, Netherlands. (Anna Elisabeth Charlotte Horn was born on 25 Sep 1883 in The Hague, 's-Gravenhage, Zuid-Holland, Netherlands and died on 18 Sep 1953 in The Hague, 's-Gravenhage, Zuid-Holland, Netherlands.)
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