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​Kieran Costello is the Managing Partner of Costello, Brennan, DeVidas, Sasso and Sinclair, P.C. Law Firm in Fairfield Connecticut.

Kieran Costello, Esq. is a member of the Connecticut Trial Lawyers of America, the Connecticut Bar Association, the American Bar Association and the American Association for Justice. In addition, Mr. Costello is the Co-Chair of the Family Law Section of the Greater Bar Association, a Member of the Elder Law Committee of the Connecticut Bar Association and a Member of the Trust and Estates Committee of the Greater Bridgeport Bar Association.

​Kieran Costello has been an Adjunct Professor of Law at Housatonic Community College since 1993. Previously, he was a Professor of Law at Albertus Magnus College and Associate Professor at the University of Bridgeport.
Kieran Costello volunteers at Fairfield Community Services, where has served on the Board of Directors, the Domestic Violence Crisis Center of Stamford/Norwalk and the Y.W.C.A. of Greenwich. He has also served as a member of the Board of Directors at the Center for Women and Families in Bridgeport where he continues to volunteer.
Kieran Costello has served as a Court-appointed Special Master in the Bridgeport and Milford Superior Courts. He also serves as a Special Master at the Regional Family Trial Docket.