Whitaker's work is very detailed, methodical and accurate. Following his retirement
from the Geological Survey he worked as a water supply consultant and continued to
publish reports on Essex water supply as follows:
Whitaker was a member of the Essex Field Club from January 1880, when he was elected
an honorary member, until his death 45 years later. He was a regular attendee at meetings
and was always prepared to lead geological field trips. The trip he led to the Croydon
Bourne, in April 1915, was the "the first of a series of extra-territorial excursions imposed
upon the Club by reason of the military occupation of our own County, which prohibited
freedom of movement in the occupied districts".
16 Essex Field Club Newsletter No. 44, May 2004