William D. Leahy
After Casablanca, Ismay accompanied Churchill to the third Washington Conference in May 1943. At the conference, Ismay first met the American Admiral William D. Leahy, who is often described as his American counterpart. The two developed a friendly relationship, and Leahy wrote in his memoirs: "General Sir Hastings Ismay became my favorite, perhaps because his position closely paralleled my own".