A.B. Buzzy" Krongard, a ... former investment banker ... was named yesterday executive director of the CIA, bringing a fast-paced management style to the agency's No. 3 job. Central Intelligence Agency Director George J. Tenet announced the appointment, saying he treasures Krongard's "wise counsel and 'no-nonsense' business-like views." Krongard, 64, former head of Alex. Brown & Co., an investment bank based in Baltimore, joined the agency three years ago as a counselor to Tenet. He switched careers shortly after helping engineer the $2.5 billion merger of Alex. Brown and Bankers Trust New York Corp., gaining $71 million in Bankers Trust stock. Few of his former colleagues were surprised by his decision to trade a $4 million salary and stock options for the far less remunerative job of Tenet's consigliere. A graduate of Princeton and the University of Maryland Law School, Krongard has a fondness for extreme military-style activities. Even as a banking executive, he trained with police SWAT teams for recreation and worked out with a kung fu master. He maintained a shooting range on the park-like grounds of his home on the northern edge of Baltimore. In an interview yesterday, Krongard described his past duties as those of a "minister without portfolio" whom senior managers felt comfortable talking to about "sticky subjects." But Krongard exhibited the requisite secretiveness when asked to explain his interest in intelligence and how he came to land a job in Tenet's inner circle. If you go back to the CIA's origins during World War II in the Office of Strategic Services, he explained, "the whole OSS was really nothing but Wall Street bankers and lawyers."