A stolperstein (] from German, literally "stumbling stone", metaphorically a "stumbling block" or a stone to "stumble upon", plural stolpersteine) is a cobblestone-size (10x10 cm ) concrete cube bearing a brass plate inscribed with the name and life dates of victims of Nazi extermination or persecution.
 The "stolperstein" art project was initiated by the German artist Gunter Demnig in 1992, and is still ongoing.
 It aims at commemorating individual persons at exactly the last place of residency—or, sometimes, work—which was freely chosen by the person before he or she fell victim to Nazi terror, euthanasia, eugenics, was deported to a concentration or extermination camp, or escaped persecution by emigration or suicide.
 s of 31 2017 , over 56,000 "stolpersteine" have been laid in 22 European countries, making the "stolperstein" project the world's largest decentralized memorial.
Since April 23, 1987, the Anti-Defamation League has given award to honor rescuers of Jews during the Holocaust era.
 The award, called Courage to Care, was renamed in 2011 as the ADL "Jan Karski Courage to Care Award" in honor of one of its 1988 recipients, Jan Karski, a Polish Righteous who provided one of the first eyewitness accounts of the Final Solution to the West.
 The ADL plaque features miniature bas-reliefs depicting the backdrop for the rescuers’ exceptional deeds during the Nazi persecution, deportation and murder of millions of Jews.
 It is a replica of the plaques which constitute the Holocaust Memorial Wall created by noted sculptor Arbit Blatas, who also created the Holocaust Memorial in Paris and the display in the old ghetto of Venice, Italy.
 The award is given during specific programs and ceremonies sponsored by the ADL, often occurring several times a year, when possible.
Holocaust Memorial is a public artwork by American artist Claire Lieberman located on the Jewish Museum Milwaukee lawn, which is near downtown Milwaukee, Wisconsin, United States.
 It is located at 1360 North Prospect Ave. This piece is 10 ft x 24 ft x 20 ft. The materials used are Corten steel, black granite, and brick.
 The "Holocaust Memorial" was created in 1983.
The Sydney Gay and Lesbian Holocaust Memorial Project was founded by a group of community activists.
 Over the years they raised funds and decided, with South Sydney City Council, on the site at Green Park in Darlinghurst, in Sydney, Australia.
 Darlinghurst is considered the heart of Sydney's gay and lesbian population.
 Green Park is adjacent to the Sydney Jewish Museum, which ensures that the memorial retains its historic meaning.
The Austrian Holocaust Memorial Service (AHMS) is an alternative to Austria's compulsory national military service / alternative service founded in 1992.
 Since 1998 it is part of the Austrian Service Abroad.
 AHMS representatives serve at major Holocaust memorial institutions in 23 countries worldwide.
 The German name is Gedenkdienst (Memorial Service).
 The organization is interested in roots and results of the Nazism and takes care of victims of Nazism.
 Women can participate since 2013.
Terry Swartzberg (born July 22, 1953 in Norwalk, Connecticut) is an American PA (public affairs) campaigner and journalist.
 He is based in Munich, Germany and contributed for 25 years to the International Herald Tribune and other international publications.
 He is especially known for his work for the holocaust memorial project Stolpersteine and for his “reality check” - since 2012 he has been wearing a kippah in public.
Judenplatz (English:"Jewish Square") is a town square in Vienna's Innere Stadt that was the center of Jewish life and the Viennese Jewish Community in the Middle Ages.
 It is located in the immediate proximity of Am Hof square, Schulhof, and Wipplingerstraße.
 It exemplifies the long and eventful history of the city and the Jewish community focused on this place.
 Archaeological excavations of the medieval synagogue are viewable underground by way of the museum on the square, Misrachi-Haus.
 Two sculptural works, a carved relief and several inscribed texts are located around the square that all have subject matter relating to Jewish history.
 One of these sculptures is a statue of Gotthold Ephraim Lessing.
 The other is a memorial to Austrian Holocaust Victims, a project based on an idea of Simon Wiesenthal and unveiled in 2000.
 Created by British artist Rachel Whiteread, the memorial is a reinforced concrete cube resembling a library with its volumes turned inside out.
 The Judenplatz is the location of the Constitutional Court of Austria and the Administrative Court of Austria.
Holocaust Memorial Day (HMD) (27 January) is a national commemoration day in the United Kingdom dedicated to the remembrance of those who suffered in The Holocaust, under Nazi Persecution, and in subsequent genocides in Cambodia, Rwanda, Bosnia and Darfur.
 It was first held in January 2001 and has been on the same date every year since.
 The chosen date is the anniversary of the liberation of Auschwitz concentration camp by the Soviet Union in 1945, the date also chosen for the International Holocaust Remembrance Day and some other national Holocaust Memorial Days.
The Memorial to the Murdered Jews of Europe (German: "Denkmal für die ermordeten Juden Europas" ), also known as the Holocaust Memorial (German: "Holocaust-Mahnmal"), is a memorial in Berlin to the Jewish victims of the Holocaust, designed by architect Peter Eisenman and engineer Buro Happold.
 It consists of a 19000 m2 site covered with 2,711 concrete slabs or "stelae", arranged in a grid pattern on a sloping field.
 The stelae are 2.38 m long, 0.95 m wide and vary in height from 0.2 to .
 They are organized in rows, 54 of them going north–south, and 87 heading east–west at right angles but set slightly askew.
 An attached underground "Place of Information" (German: "Ort der Information" ) holds the names of approximately 3 million Jewish Holocaust victims, obtained from the Israeli museum Yad Vashem.
The Oregon Holocaust Memorial is an outdoor memorial dedicated to victims of the Holocaust.
 Located in Portland, Oregon's Washington Park, the memorial was dedicated on August 29, 2004.
 Owned by the American Jewish Committee and constructed by Atlas Landscape Architecture and the Walsh Construction Company, the idea for a memorial was proposed in 1994 by Alice Kern and a local group of Holocaust survivors that met through the Oregon Holocaust Resource Center.
 According to Fodor's, the memorial is open daily from dawn to dusk and admission is free of charge.

Question: Terry Swartzberg especially known for his work for the holocaust memorial project Stolpersteine, a cobblestone-size (10x10 cm ) concrete cube bearing a brass plate inscribed with the name and life dates of victims of what persecution?
Answer: Nazi