Christiaan Johannes Nobels (1938 - 2015) was organist of the Canadian Reformed Church in Brampton, Ontario for many years.
Throughout his life he produced a number of simple arrangements for a number of Genevan Psalm melodies, as well as a number of hymns. In addition, just before his death he successfully completed a set of preludes for each of the 150 Genevan Psalm melodies.
This set of 7 variations on a tune by Orlando Gibbons was dedicated to Margaret Schoon, also organist at the Canadian Reformed Church in Brampton, Ontario.
You can find the music for this arrangement, along with many other works by Christiaan here: https://christiaannobels.com/.