Undergrad: Kenyon College, B.A., 2002 Philosophy
National University of Ireland, Maynooth

Law School: University of Pittsburgh School of Law, J.D., 2009

Areas of Focus



As a school and municipal solicitor, Kate has a broad experience in a variety of issues that arise for the firm’s municipal and public sector clients. She assists municipal and school clients on the everyday issues that they face, as well as more complex matters such as labor and employment, compliance, and land use issues. Well-versed and experienced in running public meetings and hearings, she ensures compliance with the Sunshine Law and local meeting protocol. Also comfortable in a courtroom, she has successfully argued cases in front of local magistrates, the Court of Common Pleas, and at Commonwealth Court.

Kate serves as solicitor to the boroughs of Bradford Woods, Conway, Green Tree and Oakmont, as well as the Western Allegheny Municipal Authority and the Allegheny Valley Joint Sewage Authority. She also serves as Special Counsel to the City of Aliquippa's planning commission.

She is well-known and respected throughout the region as an active presenter at statewide conferences, meetings and webinars. 

In addition to her active role as solicitor, she also works with the firm’s Municipal Tax & Creditors' Rights Group to ensure the fair and efficient collection of municipal taxes.

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Supreme Court of Pennsylvania

United States District Court for the Western District of Pennsylvania

Allegheny County Bar Association: Chair, School and Municipal Law Section

Pennsylvania Bar Association

Trustee, Pittsburgh History & Landmarks Foundation

Union Project Board Member (2013)

& Insights

GRB Law promotes Attorneys Emily J. Mueller and Kate M. Diersen to Shareholder
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Kate M. Diersen presents at the 2022 PMAA Board Member Training
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Kate M. Diersen presents for CLE about Allegheny County Property Tax Appeals
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