Evans -- representing Ward 2, which stretches from Georgetown into downtown and the Shaw neighborhood -- has said since last fall that he would run for chairman if Gray made the decision to give up the job to challenge Mayor Adrian Fenty.
A spokesman for Brown, an at-large member of the council, said Wednesday that he will run against Evans. He joined the council in 2005 and chairs the committee on economic development.
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Evans currently is the longest serving council member, having won a special election to replace the late John A. Wilson in 1990. Evans also is chairman of the influential Finance and Revenue Committee.
Evans is seen as a council ally of the mayor and could benefit from Fenty's campaign field operations. Evans also is a prolific fundraiser and is expected to have no problem in that area. He is a pro-business member of the council who also pays close attention to community needs in his ward.
Evans is less well-known citywide despite a run for mayor in 1998 -- a race that was won by Anthony Williams.
Neither Evans nor Brown has to give up their Council seats to run for chairman.