[1] In 1944, she published Where Away: A Modern Odyssey with George Sessions Perry, which told the story of the USS Marblehead.

[1] Leighton edited a collection of essays on life during the Interwar period titled The Aspirin Age: 1919-41.

[22]: 1257 In 1933, Leighton served as head of the women's committee of the National Recovery Administration campaign in New York City.

[24] Aged 17, Isabella married Herbert B. Lederer, a customer's man (registered representative) at Edward B. Smith & Co. brokerage firm.

A dozen years into this marriage, she told an interviewer that American men seek out youth to their detriment, and that an older woman has more to offer, not least in constructive companionship.

[23] On February 15, 1935, at Norwalk, Connecticut, Leighton married Frederic A. Willis, assistant to William S. Paley, the president of Columbia Broadcasting System.

[25] Her second husband was a grandson of British Army officer Frederick Willis and a distant cousin of Winston Churchill through the Jerome family.

[30] His ex-wife, Frances Wilkinson, married Italian ambassador Augusto Rosso ("Mussolini's man") in January 1937.

[35] In October 1964, she hosted a party for Rhodes and his co-author Merle Miller on the publication of their book Only You, Dick Daring[35] (subtitled OR, HOW TO WRITE ONE TELEVISION SCRIPT AND MAKE $50,000,000, A TRUE-LIFE ADVENTURE).

Guests included her brother-in-law Ellsworth Bunker, Joshua Logan and his wife Nedda Harrigan, and Hugh John Casey.

[4] It includes scripts for The Sapphire Ring, Cadge, and Mercenary Mary, as well as correspondence from John Kenneth Galbraith, Henry Kissinger, and Archibald MacLeish.

[38]: 89 With Arthur Bunker having graduated from Yale University's Sheffield Scientific School in 1916, Leighton left a bequest following her death to create a new chair in hematology called the Arthur H. and Isabel Bunker Associate Professor in Medicine.