And here he is. In an ironic twist, it appears the "G" stands for Gardiner.
Robert Gardiner Wemple (1901 - 1955): Born in New York, USA on 1901 to Robert Gardiner Wemple and Lillie Renner. Robert Gardiner married Florence Bager. Robert Gardiner married Patricia Dunn. Robert Gardiner married Living Cooper and had 2 children. He passed away on 9 Jan 1955 in Las Vegas, Nevada, USA.http://tinyurl.com/3ra6qatHe attended Brooklyn Polytechnic College Brooklyn, NY. Over the years, he also attended the following schools and courses: Northeast Airlines School/CAA Standardizing Center/Advanced Aerobatics Course/Army Air Corps Basic Training Center, Randolf Field, TX/CAA Standardizing Center for Instrument & Multi-Engine Course.
Among his many pursuits in earning a livelihood, he was a barnstormer pilot, a plantation manager in Jamaica, British West Indies; Manager of the Flight Training Division, Pitcairn Aviation Inc.;
Survey Pilot for Pitcairn and assisted in the
design of the Pitcairn Mailwing airplane; Operation Manager, Central Airport, Camden, NJ; associated with
Wood Aerial Surveys, Philadelphia; Director of Aviation, Ocala, FL; District Flight Supervisor, Florida; with CAA/Regional Principal Flight Supervisor, CAA Fort Worth, TX; Civilian Pilot Training and War Training Service flight training Schools; associated with J.M. West, Houston capitalist, in forming West Central Airlines, Inc.; Field Representative & Technical Correspondent, Air Review Publishing Company, Dallas, TX; Personal pilot for E.B. Fletcher, independent oil producer, Dallas, TX. GJW
http://tinyurl.com/3vhxpelNote: I'm not hell-bent on proving he modded AE's plane, but his (if only casually) discussing such a thing seems within the range of possibility.