William Holder was a mathematician and was to have a very strong influence on Christopher who spent much time at Bletchingham. Holder essentially took on the role of mathematics tutor to Wren and also encouraged him to experiment with astronomy.
William Holder ay isang dalub-agbilang at noon ay upang magkaroon ng isang malakas na impluwensiya sa Christopher na ginugugol ng maraming panahon sa Bletchingham. Holder kinuha sa mahalagang papel na ginagampanan ng mga propesor sa matematika Wren at hinihimok din siya sa eksperimento sa astronomy.