Education: faculty of Law and Administration, Warsaw University.

Member of The Regional Chamber of Attorneys in Warsaw.
1989-1993 legal advisor to many economic groups.
Co-founder and Partner of Siwek Gaczyński s.c. transformed then to sp.p..
Specialist in Corporate Law and civil procedures.
Experienced practitioner in the field of international arbitration.
Author and co-author of numerous publications – among others, co-author of legal advice for Telekomunikacja Polska S.A. relating to telecommunications law in EU.
Author of articles regarding court of conciliation and conciliatory jurisdiction, social aspects in institutional funds of social services, the right of preemption and others.
His specialization lies with Civil, Business Law and Energy Law.