Exhibit 99.1

JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1) under the Securities and Exchange Act of 1934, each of the undersigned hereby agrees that only one statement containing the information required by this Schedule 13G/A, and any further amendments to such Schedule 13G, need be filed with respect to the ownership by each of the undersigned of shares of stock of ICF International, Inc. This Agreement may be executed in any number of counterparts, each of which shall be deemed an original.

Dated: January 31, 2008

JOEL R. JACKS
By:	/s/ Joel R. Jacks
Name:	Joel R. Jacks
PETER M. SCHULTE
By:	/s/ Peter M. Schulte
Name:	Peter M. Schulte
CM EQUITY PARTNERS, L.P.
By:	CMLS GP, L.P.
	its general partner
	By:	CMLS General Partner, LLC,
		its general partner
By:	/s/ Peter M. Schulte
	Peter M. Schulte, Managing Member
CMEP CO-INVESTMENT ICF, L.P.
By:	CMLS GP, L.P.
	its general partner
	By:	CMLS General Partner, LLC,
		its general partner
By:	/s/ Peter M. Schulte
	Peter M. Schulte, Managing Member

CM EQUITY PARTNERS II, L.P.
By:	LYNX II GP, L.P.
	its general partner
	By:	LPE II, LLC,
		its general partner
By:	/s/ Peter M. Schulte
	Peter M. Schulte, Managing Member
CM EQUITY PARTNERS II CO-INVESTORS, L.P.
By:	LPE II CO-INVESTORS, LLC
	its general partner
By:	/s/ Peter M. Schulte
	Peter M. Schulte, Managing Member
CMLS GP, L.P.
By:	CMLS General Partner, LLC,
	its general partner
By:	/s/ Peter M. Schulte
	Peter M. Schulte, Managing Member
CMLS GENERAL PARTNER, LLC
By:	/s/ Peter M. Schulte
	Peter M. Schulte, Managing Member
LYNX II GP, L.P.
By:	LPE II, LLC,
	its general partner
By:	/s/ Peter M. Schulte
	Peter M. Schulte, Managing Member
LPE II, LLC
By:	/s/ Peter M. Schulte
	Peter M. Schulte, Managing Member
LPE II CO-INVESTORS, LLC
By:	/s/ Peter M. Schulte
	Peter M. Schulte, Managing Member