Question: Who was the father of the man who founded the Ph.D. work of Paul Austin Johnsgard?

Context paragraphs:
Paul Johnsgard: Paul Austin Johnsgard (born 28 June 1931) is an ornithologist, artist and emeritus professor at the University of Nebraska.  His works include nearly fifty books including several monographs, principally about the waterfowl and cranes.  Born in Fargo, North Dakota, he was introduced to the study of birds by a distant cousin who was a game warden.  He spent these early years taking part in duck counts.  After high school and junior college at Wahpeton, he enrolled at North Dakota State University to major in zoology.  He then moved to Washington State University for his master's degree, encouraged by a professor who suggested that he could have a career in ornithology.  His master's study was on the impact of the construction of O'Sullivan Dam to wetland habitats.  Apart from the data collected and his interpretation, it included his pen sketches.  This was published in "The Condor" and the article attracted the attention of Charles Sibley who invited him to consider a Ph.D. at Cornell University with him.  His Ph.D. work was on the phylogeny of six ducks, after which he moved to England at the Wildfowl Trust at Gloucestershire founded by Sir Peter Scott.  After the course of two years, he produced his first book, the "Handbook of Waterfowl Behaviour" published by Cornell University in 1965.  He is considered one of the most prolific authors of ornithology books.

Paul A. Crotty: Paul Austin Crotty (born 1941) is a Senior United States District Judge of the United States District Court for the Southern District of New York.

Peter Scott: Sir Peter Markham Scott, (14 September 1909 – 29 August 1989) was a British ornithologist, conservationist, painter, naval officer, broadcaster and sportsman.  He was the only child of Robert Falcon Scott.

Fireclown: Fireclown were a British heavy metal band from Manchester, England formed in 1979.  The band consisted of Tony Dowler on lead guitar and vocals, Steve "Gyp" Nicholson on guitar, Pete Dutton on bass guitar and Graham Derbyshire on drums.  In 1983 they added lead vocalist Paul Austin and released the 10" single "Invasion", with B-side songs "Poor Man" and "Magic", on their self-titled Fireclown Records.  Ross Aspden was a regular member of the road crew, driving the bus and rigging the lights on a nightly basis.  Tony Dowler now fronts the Tony Dowler Band and The Hellhounds.  Gyp Nicholson went on to write and record his own album named "Gringo Land" under the name of "Mexican Roadsweepers."  http://mexicanroadsweepers.net/

Bob Cutler: Robert Bradley "Bob" Cutler (November 8, 1913 – September 1, 2010) was an American rower who competed in the 1936 Summer Olympics in Berlin.  In the men's coxed fours event his team, which consisted of himself, his brother Roger, William Haskins, Paul Austin, and Edward Bennett, were eliminated in the semi-finals.

Paul Whitener: Paul Austin Wayne Whitener (1911-1959) was an American landscape painter and museum director.  He founded the Hickory Museum of Art in 1944, and served as Director until his death in 1959.

Fireclown Records: Fireclown Records or the Invasion EP is a rare EP released by Fireclown in 1983.  This extended play included Paul Austin on vocals, Steve "Gyp" Nicholson on rhythm guitar, Tony Dowler on lead guitar, Pete Dutton on bass guitar, and Graham Derbyshire on the drums.  This was the only thing that Fireclown ever released, never becoming a completely successful band.  The EP includes Side AA with "Invasion", and Side BB with "Poor Man", and "Magic".

Paul Austin Kelly: Paul Austin Kelly (born 1960) is an American singer.  A former rock musician who has sung opera, the tenor and also writes, records and performs music for children.

Dark Universe (film): Dark Universe is a 1993 horror/science-fiction film starring Blake Pickett, Cherie Scott, Bently Title, John Maynard, Paul Austin Saunders, Patrick Moran, Tom Ferguson, Steve Barkett, and Joe Estevez as Rod Kendrick.  The soundtrack was composed by Jeffrey Walton.  The film was written by Patrick Moran, executive-produced by Fred Olen Ray, Grant Austin Waldman, and Jim Wynorski, and directed by Steve Latshaw.

J. Paul Austin: John Paul Austin (February 14, 1915 – December 26, 1985) was Chairman, President and CEO of The Coca-Cola Company.  From 1962 to 1981 Austin oversaw the growth of the company from $567 million in sales to a $5.9 billion global force, an unprecedented growth that has not been replicated.

Supporting paragraphs: Paul Johnsgard Peter Scott
Answer: Robert Falcon Scott