It was Charles' 1976 publication of Sons and Daughters of Jesse: A 360 Year History of the Whipple Family--which I stumbled across in the late 1970s or early 1980s--that first motivated my interest in Whipple genealogy. Later, his publications played a major part in the "eureka moment" I experienced in 1997, when I realized that my ancestor, Captain John, was not the same person as the John Whipple of Bocking, England that came to America in 1638--six years after the arrival of teenage John (the future Captain John of Rhode Island).
In his email, Charles stated that "It has puzzled me for sometime as to why the Ipswich family and the Rhode Island family are so dissimilar [speaking of Y-DNA haplogroups]." Charles continued by referencing the 2006 article by William Fisk that extended the Ipswich Whipple line two generations, to Thomas Whipple of Bishops Stortford, England. (See William Wyman Fisk, "The Whipple Family of Bishops Stortford, Hertfordshire: Proposed Ancestral Origin of Matthew Whipple of Bocking, Essex ..." The Genealogist 20 (Fall 2006): 191-217.)