Professor Kulesza is one of the main authors of the administrative reforms in Poland (after 1989) He was an expert advisor and one of the authors of the 1990 Local Government Act and numerous subsequent bills, programmes and acts on public administration. He acted as a government adviser (1991 - 1992), Government Plenipotentiary for Public Administration Reform (Undersecretary of State at the Office of the Council of Ministers in 1992 - 1994 and Secretary of State at the Chancellery of the Prime Minister in 1997 - 1999).

Professor Kulesza was one of the authors of several bills in various areas of public law and the state administrative system, including the Administrative Reform Act, Spatial Development Act, Municipal Services Management Act, and the Public-Private Partnerships Act. He is a co-author of commentaries on the Municipal Services Management Act and the Public-Private Partnerships Act.

Professor Kulesza is founder and first editor-in-chief of the local government weekly "Wspólnota" and founder and editor-in-chief of "Samorząd Terytorialny" monthly.