Bar Admissions

  • Maryland
  • District of Columbia

Court Admissions

  • U.S. Court of Appeals for the Second Circuit
  • U.S. Court of Appeals for the Eighth Circuit
  • U.S. District Court for the District of Maryland


  • J.D., University of Maryland School of Law, 1999
  • B.A., Yale University, 1995

Judicial Clerkships

  • Honorable Kermit E. Bye, U.S. Court of Appeals for the Eighth Circuit, 2001 - 2002
  • Honorable Mark W. Bennett, Chief Judge, U.S. District Court for the Northern District of Iowa, 1999 - 2001


  • Maryland State Bar Association

    Women's Bar Association of Maryland

    American Bar Association

    J. Dudley Digges Inn of Court
T +1 410.244.7893
F +1 410.244.7742

Colleen Mallon Casse


Colleen Mallon Casse focuses her practice on complex commercial and real estate litigation, and regularly represents clients in state and federal courts. Colleen has extensive experience representing lenders and special servicers in the commercial mortgage-backed securities (CMBS) industry involving put-back or repurchase claims, intercreditor disputes, lender liability claims, and all types of business disputes.

Significant Matters

Colleen has litigated some of the country's leading CMBS put-back claims in which she has helped define the rights of CMBS trusts and mortgage loan sellers. She helped lead a litigation team that ultimately paved the way to the successful disposition of Stuyvesant Town. Colleen successfully obtained a decision of first impression involving the interpretation of no-action clauses in securitization trust documents. See Teachers Ins. & Annuity, et al. v. CRIIMI MAE Serv. Ltd. P'ship, et al., 2011 WL 403428 (S.D.N.Y. Feb. 8, 2011) and Teachers Ins. & Annuity, et al., v. CRIIMI MAE Serv. Ltd. P'ship, et al., 681 F. Supp. 2d 501 (S.D.N.Y. 2010). She prevented mezzanine lenders from intervening and halting the foreclosure of Stuyvesant Town. See Bank of Am., et al. v. PCV ST Owner LP, et al, 10 Civ. 1178 (AJK) (S.D.N.Y). Colleen obtained a TRO against mezzanine lenders that prevented them from acquiring or selling the equity interests in the borrowers without prior payment of the total amount due under the senior loan. See Bank of Am., et al. v. PSW NYC LLC, No. 651293/10, 2010 WL 4243437 (N.Y. Sup. Sept. 16, 2010).

Colleen formerly played a key role in Venable’s representation of Enron Creditors Recovery Corp., successfully recovering more than $250 million for the estate of Enron.


Colleen is a trustee and board member of The Venable Foundation. Colleen previously served as Co-Chair of WAVe (Women Attorneys at Venable), Venable's affinity group for women attorneys, and chaired the firm's Partnership Selection Committee. Colleen is a 2008 graduate of the GBC Leadership Program.


Selected for inclusion in Maryland Super Lawyers Rising Star Edition, 2013

Selected for inclusion in Maryland Super Lawyers, 2012

Named a Leading Woman by The Daily Record, 2010