Diel has dedicated her entire practice to helping families in Milwaukee and the surrounding areas find positive solutions to a wide variety of family law concerns. Clients turn to her for skilled mediation and collaborative law representation. Diel is a past President of the State Bar of Wisconsin. She also served on the State Bar's Board of Governors and the Committee on Professional Ethics. Diel is a former board member and President of the International Academy of Collaborative Professionals. She has also held leadership roles with the Collaborative Family Law Council, the Association of Women Lawyers. Currently, Diel also serves as a Port of Milwaukee Harbor Commissioner. She is a 1976 graduate of the University of Wisconsin Law School in Madison.