J. Christopher Flowers says the past six months have been as good as it gets-yet he is leaving Goldman, Sachs & Co. at the end of November.

On April 13 Mr. Flowers, the head of bank mergers at Goldman, entered investment banking nirvana when two of his firm's clients, BankAmerica Corp. and First Chicago NBD Corp., announced blockbuster mergers with a combined value at the time of $90 billion. Besides generating big headlines, the deals would bring the firm about $40 million in fees.

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