He specialized in sales and marketing and was responsible for, for instance, the packaging of Verkade cookies in metal tins, which quickly became collector's items.
One of his successful marketing ploys was the Verkade album; customers received a picture card with every roll of Verkade rusk which they glued into albums.
These albums were on topics such as history, art, and especially nature--the latter written by Dutch botanist Jac.
Generating a collecting mania among the Dutch population before World War II, 27 albums were made, a total of 3.2 million copies.
[2] In 2005 he published an autobiography, Een leven in biskwie en chocolade ("A life in biscuits and chocolate").