Hagen is the Director of an unnamed U.S. Intelligence agency.
Before she became a powerhouse in the high-end romance novel field, Kay Hooper perfected her craft with an interesting romance-spy series for Bantam's Loveswept line. This brand name ran from the mid 80's to the end of the 90's, numbering just over 900 books and featuring many of the top writing talent in the business. The series was popular with readers and with writers as the books were short, fast, and contained a good amount of humor.
It is hard to say whether Ms. Hooper intended the series to be an espionage one when she began as the first book had no noticeable spy element in it, nor did the spy master Hagen make an appearance. It did, however, set the stage for major characters that were drawn, usually without wanting to be, by Hagen into his schemes.
The premise of the series is that Hagen is in charge of this secret agency with a limited number of agents around the world. While the majority of these seem to be beautiful women, he does have one or two males in his employ.
The main characters running throughout the series, in addition to Hagen, include Josh Long, an extremely wealthy and dynamic businessman, and his three most trusted associates and friends, Rafferty the lawyer, Zach the security chief, and Lucas the chief investigator.
Hagen is a manipulator. Described as a rotund little man, 5'4, with the face of a cherub with fat rosy cheeks and small twinkling eyes. He certainly did not give the appearance of a man with the keen intellect that he had but this just helped him pull off some of his machinations.