In 1998, Kochanowski became a member of the team formed to assess the creation of a Civil Service in Poland and was the author of the report prepared at that time.

In 2003-2005, he led a think-tank which was devoted to an analysis of the problems of the state and to the preparation of a reform programme and whose work would be summed up in a volume of cases entitled "Repairing the Republic".

He was listed on the flight manifest[1] of the Tupolev Tu-154 of the 36th Special Aviation Regiment carrying the President of Poland Lech Kaczyński which crashed near Smolensk-North airport near Pechersk near Smolensk, Russia, on 10 April 2010, killing all aboard.

He was also the editor of a special edition published this year in the United States of America by American Behavioral Scientist and entitled "International Terrorism Through Polish Eyes".

Many of these works were published in German and English, including Über die Wandlung der strafrechtlichen Verantwortung und die sich verringernde Rolle dieser Verantwortung im gesellschaftlichen Leben "Zeitschrift für Rechtsvergleichung" (1978), Zur Problematik der Verkündung von Strafgesetzen in Polen, "Jahrbuch für Ostrecht" (1986), "Reasonable Man" Standards in Continental Law, ("The Journal of Legislative Studies" 1995), Penal Law in Confrontation with the Nightmares of the Past and Challenges of the Present Day (Penal law in relation to the change in the political system in Poland between 1990 and 2000).

Kochanowski was the author of several works for the Polish Parliament and Government, including: Projekt ustawy o służbie zagranicznej ["A Bill Concerning the Foreign Services"] (1998), commissioned by the Ministry for Foreign Affairs; Raport o tworzeniu służby cywilnej w latach 1996 - 97 ["A Report about the Creation of a Civil Service 1996-1997"], prepared within the framework of a commission formed by the Prime Minister; Analizy i oceny kodeksu karnego z 1997 na tle innych polskich kodyfikacji karnych ["Analyses and Assessments of the 1997 Penal Code against the Background of Other Polish Penal Codifications"] (1999), commissioned by the Polish Parliament's Bureau for Studies and Expert Appraisements, as well as many other export appraisements for the Parliament.