President of the Board and co-founder of Ordo Iuris Institute, Chairman of the Ordo Iuris Foundation Council. Architect of the Center for Litigation Intervention of the Institute. Advocate and managing partner in Parchimowicz & Kwaśniewski Law Firm (est. 2008).
He has long-term experience in civil litigation and penal proceedings focused on protection of civil rights and freedoms, rights of the family and children's rights. Providing legal services for Polish and European private and corporate clients, providing pro bono legal support to conservative family and human rights movements in Europe.
He represented citizens and civil society organizations in many precedent cases before national and international courts and tribunals, as well as in consultation process at the invitation of international bodies such as Venice Commission or Office for Democratic Institutions and Human Rights of the OSCE. His support was essential in formation of numerous civil society and membership organizations participating in public debate in the field of human rights. In 2016, deputy representative of the "Stop Abortion" Legislative Initiative Committee.
In law practice advises national and international associations, foundations, co-operatives and entrepreneurs’ organizations (i.a. Association of International Road Transport Carriers in Poland, Association of Polish Visual Artists). Until 2017, Jerzy Kwaśniewski was the CEO of Polish Wine Council.
Jerzy Kwaśniewski was appointed to advisory councils of four Ministers of Justice, including Council for the Strategy of Modernization of Justice Area in Poland and the Council for the Protection of Family Autonomy and Family Life. Member and secretary of the governmental Monitoring Council for the Prevention of Domestic Violence in the 3rd term of office from 2017. In March 2019, appointed by the Polish Episcopal Conference to the Council of the Bona Fama Foundation.
Member of the International Association of Genocide Scholars (since 2017), International Bar Association (i.a. Litigation Committee, Arbitration Committee, War Crimes Committee) and IBA Human Rights Institute.
Regularly listed as one of the most influential Polish lawyers. Among "28 most powerful people in Europe in 2021" according to Politico.
He and his wife Beata are parents of Szymon, Łucja, Danuta, Przemek, Wanda and Emil(✞).