The Pennsylvania State University mathematics professor, Boris Weisfeiler, 1979

Map of the area where Boris Weisfeiler was hiking and disappeared on January 4 1985 ("Rutas de Chile 2002" Copec).

Boris took a bus from Santiago to Los Angeles (1). In a LA hotel he asked directions to Lake Laja (2). Boris disappeared near confluence Los Sauces and Nuble Rivers (3).

Santiago, Chile. The Supreme Court.

Santiago, Chile. The US Embassy (Photo courtesy of the Santiago Times.)

Santiago, Chile. Plaza de La Constitucion and Palacio de La Moneda (Presidential Palace.)

Santiago, Chile. The Supreme Court. Office of the Court of the Appeals' judge Jorge Zepeda.

2015. After the last meeting with investigating Judge Jorge Zepeda.

2015. At the meeting in the U.S. Consulate.

2015. Julie C. Monteleone, Economic and Political Specialist, at the meeting in the U.S. Consulate.

2015. Consul Guallpa-Lliguichuzhca (R) and Julie Monteleone at the meeting with Francisco Ugas, Secretario Executivo HR Program.

20014. The U.S. Ambassador to Chile, Michael A. Hammer, and Olga Weisfeiler

2014. Consul Tristan Spieceland (L), Gabriel Lathrop, and attorney Hernan Fernandez (R) after the meeting with Judge Zepeda.

2014. Gabriel Lathrop, Senior Consular Assistant, at the meeting in US Consulate.

2011. Visit to Museo De la Memoria y los Derechos Humanos. Olga Weisfeiler and Gabriel Lathrop (R).

2011. Olga and Lev (L) Weisfeiler visited Museum of Memory and Human Rights (Museo De La Memoria y los Derechos Humanos.)

2011. Visit to Museo De la Memoria y los Derechos Humanos.

Judge investigating the Weisfeiler case Ministro of the Court of Appeals Jorge Zepeda.

2011. After the meeting with investigating Judge Jorge Zepeda.

2011. The U.S. Ambassador to Chile, Alejandro D. Wolff.

2011. The U.S. Ambassador, Alejandro D. Wolff (L), Olga and Lev Weisfeiler (R)

2011. Meeting with the U.S. Ambassador Alejandro D. Wolff (C): Consul William Whitaker (L), and Olga Weisfeiler (R)

2010. The PDI (Policia De Investigaciones) and the FBI (Legal Attaches of the US Embassy) were working together on investigation

2010. March 4, 2010. At the Human Rights Commission.

2010. Member of La Comisión is receiving from Olga Weisfeiler documentation on Boris Weisfeiler's disappearance in Chile.

2010. The U.S. Ambassador to Chile, Paul E. Simons (from 9 November 2007 to 2010)

2010. Consul William W. Whitaker at the meeting of the Weisfeiler family with Ambassador Simons.

2010. Olga and Lev Weisfeiler at the meeting with Ambassador Paul Simons.

2010. After the meeting with Ministro of the Supreme Court Sergio Munoz.

2008. The US Embassy, Santiago: meeting with Ambassador Simons (L) Olga and Anna Weisfeiler(2R)

2008. The US Embassy: Ambassador Simons and Olga Weisfeiler at the press conference, January 2008.

2008. The US Embassy: Ambassador Simons and Olga Weisfeiler at the press conference, January 2008.

2008. The US Embassy, Santiago: after the press conference - interview with BBC correspondent Gideon Long, January 2008.

2008. Meeting with Defense Subsecretario Gonzalo Garcia Pino (R).

2008. After the meeting at the Ministry of Defense.

2008. Palacio de la Moneda. Olga Weisfeiler at the meeting with Secretary General of the Presidency Jose Antonio Viera-Galo (L)

2008. Anna (L) and Olga Weisfeiler at the meeting with Ministro Secretario General de la Presidencia, Jose Antonio Viera-Gallo

2008. President Michelle Bachelet (L) and Olga Weisfeiler (R) - accidental meeting in a hotel's lobby.

2007. The U.S. Ambassador to Chile, Craig Kelly (from 2004-2007.)

2007. Consul General Sean Murphy at the Ambassador's meeting with Olga and Anna Weisfeiler.

2007. Attorney Hernán Fernández at the meeting with the U.S Ambassador Craig Kelly.

2007. Meeting with the U.S. Ambassador, Craig Kelly, and other officers of the U.S. embassy.

2007. Discussion with attorney Fernandez (C) and officers of the US Embassy after the meeting with judge Zepeda.

2007. The U.S. Ambassador to Chile, Craig Kelly, and Anna Weisfeiler.

2007. U.S. Ambassador to Chile Craig Kelly at the meeting with Olga and Anna Weisfeiler

2007. The U.S. Ambassador Kelly and Olga Weisfeiler at Media Availability; the U.S. Embassy, Santiago, Chile; March 22, 2007

2007. The U.S. Ambassador, Craig Kelly, and Olga Weisfeiler at Media Availability. The U.S. Embassy, March 22, 2007.

2007. The U.S. Ambassador, Craig Kelly, and Olga Weisfeiler at Media Availability. The U.S. Embassy, March 22, 2007.

2007. At the meeting with CDE President Carlos Mackenney (C), and CDE' lawyer Maria Tereza Munoz (L).

2007. At the meeting with CDE President Carlos Mackenney.

2007. Consejo de Defensa del Estado (CDE) building.

2006. US. Washington D.C., Blair House. Meeting with President of Chile Michelle Bachelet. June 9, 2006.

2006. US. Washington D.C., Blair House. Meeting with President of Chile, Michelle Bachelet (2R). June 9, 2006.

2006. Meeting with the U.S. Ambassador to Chile, Craig Kelly.

2006. The U.S. Amb. to Chile, Craig Kelly, and Mrs. Olga Weisfeiler held a joint-press conference.

2006. The U.S. Amb. to Chile, Craig Kelly, and Mrs. Olga Weisfeiler held a joint-press conference.

2006. The U.S. Amb. to Chile, Craig Kelly, and Mrs. Olga Weisfeiler held a joint-press conference.

2006. A bi-partisan group of 27 US Senators and Representatives wrote a formal letter of inquiry to President of Chile Bachelet.

2006. The U.S. congressional letter stamped ‘received’ by the Chilean presidential office.

2006. Ministro Jorge Zepeda, a judge in charge of the Weisfeiler's case since May 2005.

2004. Palacio Ariztía: on December 2, 2004 there was a press conference that concluded Weisfeiler's November’s trip to Chile.

2004. At a press conference at Palacio Artizia: Olga Weisfeiler (C) and Pascale Bonnefoy (R)

2004. Sebastian Brett (HRW)(L), Larry Rohter (NYT), Viviana Candia (La Segunda), Jeffrey Galvin (the U.S. Embassy) (R)

2004. Sebastian Brett, senior researcher of Human Rights Watch - Americas Division, (HRW) at the press conference on December 2

2004. Larry Rohter, the New York Times Southern Cone correspondent (NYT)

2004. Delivery to La Moneda of an open letter to President Lagos calling for investigation into Colonia Dignidad.

2004. At the event: Sebastian Brett, Senior researcher of Human Rights Watch Americas Division (HRW)

2004. At the event: Sergio Laurenti, Director Amnesty International (AI-Chile).

November 2004. Olga Weisfeiler.

2004. Weisfeiler's (L) and Visser (R) families after the meeting with Minister of Interior Jose Muguel Insulza (C).

November 2004. The U.S. Ambassador to Chile, Craig Kelly (from 2004-2007.)

2004. Judge Alejandro Solis during the meeting with the Weisfeiler family on March 8, 2004.

2004. Maria Raquel Mejias Silva, Executive Secretary of the Human Rights Program of the Ministry of the Interior, at the meeting

March 2004. Santiago, the U.S. Embassy: a news conference with Chargé d'Affaires Philip Goldberg and Olga Weisfeiler

March 2004. Santiago, the U.S. Embassy: journalist Pascale Bonnefoy (R) is helping with a translation during a news conference.

2004. Santiago, a news conference was announcing a campaign to seek information about the fate of U.S. citizen Professor Boris

March 2004: more then twenty reporters from different world press agencies, newspapers, and TV stations were at news conference.

March 2004. San Carlos: Judge Angel Esteban Coria Ricotti was assigned to the case in 1985 and again in 2000.

2002. Michelle Bachelet, then Minister of Defense at the meeting with Olga Weisfeiler and human rights lawyers.

2002. Michelle Bachelet, then Minister of Defense under former President Ricardo Lagos, was briefed on the Weisfeiler case.

2002. According to the Supreme Court order, Judge Alejandro Solis (L), assumed responsibility for the Weisfeiler case.

2002. Meeting with PDI officials: Inspector Sandro Gaete (L), Olga Weisfeiler, Director General Nelson Mery, and Anna Weisfeiler

2002. Meeting with Luis Henriquez, Prefecto Inspector of the Policia de Investigaciones de Chile.

2002. Linares, Chile: a conversation with a local Bishop, Obispo de Linares, Carlos Camus Larenas.

2002. In search for information Olga Weisfeiler had a talk at “Off the Record” cafe.

2002. Los Sauces River: The PDI investigators brought us to the place where from Boris disappeared on January 4 1985 .

San Fabian, Chile. A local man, Jose Lopez, with who Boris spent his last night of freedom.

2002. Los Sauces River: an invented story about "Boris' boot print" told by a local man."

2002. While following a man, we took a long walk from the cable bridge to the confluence of two rivers.

2002. Los Sauces River: the confluence with Nuble River — it’s deepest and widest area.

2002. Los Sauces River: Olga at the confluence with Nuble River — it’s deepest and widest area.

2002. Santiago, Chile. At the Supreme Court: group of the Chilean and of the U.S. lawyers representing the Weisfeiler case.

2002. New York, US. meeting with a group of Chilean and US human rights lawyers ready to work on the case on pro-bono basis.

2000. The U.S. Ambassador to Chile, John O'Leary

2000. At the reception of Amb. John O'Leary residence: Amb. O'Leary (L), Olga Weisfeiler, Lev Weisfeiler (R).

2000. Judge Juan Guzman Tapia. A judge responsible for case's investigation for the next year and a half.

2000. A meeting with Judge Juan Guzman Tapia: Peter Kornbluh (L) Olga Weisfeiler, Judge Juan Guzman, Anna Weisfeiler (R).

2000. Interview with newspaper reporters after the meeting with Judge Juan Guzman: Anna (L), Lev (C) and Olga (R) Weisfeiler.

2000. Jose Zalaquett, attorney, former member of the Human Rights Rettig Commission (1990-1991)

2000. Reporter Santiago Pavlovic (R), with Lev (L), and Olga Weisfeiler, and Peter Kornbluh.

December 2000. Weisfeilers first trip to Chile: meeting with attorney Hernan Fernandez and reporter Viviana Candia.

Santiago, Chile. A window inside of the PDI (Police Investigation) building.