Blue Book was headed by Ruppelt, then Captain Hardin, Captain Gregory, Major Friend, and finally Major Hector Quintanilla. Hynek had kind words only for Ruppelt and Friend. Of Ruppelt, he wrote "In my contacts with him I found him to be honest and seriously puzzled about the whole phenomenon." Of Friend, he wrote "Of all the officers I worked with in Blue Book, Colonel Friend earned my respect. Whatever private views he may have held, he was a total and practical realist, and sitting where he could see the scoreboard, he recognized the limitations of his office but conducted himself with dignity and a total lack of the bombast that characterized several of the other Blue Book heads."