Member of the CASE Supervisory Council
- owner of the consulting company „Zarządzanie i Organizacja Krzysztof Chmielewski” (1997-present).
- Consultant for the companies: Stacja Paliw RG LLC (1998-2003), LOTOS Mazowsze SA (2004-2005), LOTOS Gaz SA (2006), LOTOS Czechowice SA (2007-2011),
- Member of Supervisory Board ZAP MM LLC (2000-2002), Member of Supervisory Board U-Cont MM LLC 2005-2011),
- Director and Proxy in Biurze Zarządzania Nieruchomościami Sp. z o.o. (1996 - 1997),
- Vice President of the Supervisory Board of Polskie Ksiazki Telefoniczne (1994-1995),
- Advisor on Restructuring and Privatization to the Board of RUCH S.A. (1992 - 1994),
- Director of Entrepreneurship Institute in TWIGGER SA (1990 - 1992), Advisor to the President of the Board (1997 - 2003), Member of Supervisory Board (1995-2006),
- Co-Founder of CASE, Member of the Supervisory Council ( since 1991), Vice President of the Board (1992 – 1995),
- Employed in the LOT Polish Airlines as: Advisor of Directors on reorganization; Coordinator of car fleet development and modernization team (1986 - 1990),
- PhD Candidate in Systems Research Institute Polish Academy of Science (1975 - 1978).