McDonnell & Adels, PC was founded in 1995 by Patrick J. McDonnell and Elizabeth Adels, Esqs. The Firm later added two additional members, Evan W. Klestzick, Esq. and Edward M. Ryan, Esq., re-forming into McDonnell Adels & Klestzick, PLLC.
In 2021, Stuart M. Flamen, Esq., and Michael D. Hanratty, Esq. joined Evan W. Klestzick, Esq. and Edward M. Ryan, Esq. as members of McDonnell Adels & Klestzick, PLLC. Currently, the Firm has more than fifteen attorneys, most of whom have been with the Firm for more than ten years.