[1] He would later play a major role in the No-Conscription Fellowship, an organization that united and supported conscientious objectors in Britain during World War One.
[7] In the 1880s Grubb began to develop an interest in social concerns, even cutting back on his teaching in order to devote time to the study of economics and to public work.
[8] In keeping with his desire to reconcile faith with science, Grubb was among those who vocally and successfully opposed the adoption of the Richmond Declaration by London Yearly Meeting in 1888.
[9] Soon after, as a result of his regular participation in meeting for worship, Grubb was officially recorded as a minister in the Religious Society of Friends.
[12]The Oxford Dictionary of National Biography records that Grubb was buried on 26 January 1939 at the Hitchin Quaker burial ground.