what did he do between the wars?
He returned to Australia, got married and joined the newly formed Royal Australian Force.
Harry Cobby
He returned to Australia in May 1919, and married Hilda Maude Urban in Caulfield, Victoria, on 24 April 1920; the couple had a son and a daughter. Following the disbandment of the AFC, Cobby joined the newly formed Royal Australian Air Force in 1921. 
who is harry cobby? A military aviator and an Air Commodore. where is he from? Australia. how did he start his early career? He was a bank clerk in the beginning. Later he joined the AFC. which bank did he work for? The Commonwealth Bank. when was this bank founded? In 1911. was there a scandal regarding this? Yes, it was reported alleged systemic issues about the insurance division of CBA. what steps were taken after this scandal? Two parliamentary inquiries were conducted. The Financial Services Royal Commission was called and they earthed further malpractices. what are its international operations? UNANSWERABLE what was the aforementioned person's post-war career? He had rejoined the Civil Aviation Board after leaving the RAAF and served as Regional Director, New South Wales.
wiki:6102558
Harry Cobby [SEP] Between the wars
Restless in the inter-war years, Cobby retired from the Air Force to join the Civil Aviation Board as Controller of Operations in 1936; he also contributed to aviation magazines such as "Australian Airmen" and "Popular Flying". His civil aviation duties included aircraft inspection, the issuing of licences and airworthiness certificates, maintenance of radio and meteorological services, and RAAF liaison. After the creation of a new Department of Civil Aviation in November 1938, the Civil Aviation Board was reorganised and Cobby's position was made redundant. The civil aviation minister James Fairbairn – himself a World War I pilot – lobbied Prime Minister Robert Menzies on his behalf, stating it was "unthinkable that Wing Commander Cobby's appointment should be terminated without some other position being found for him".