Referent und Gastdozent
Dr. Gabriel ist renommierter Referent, Konferenzsprecher und Gastdozent und hat als solcher weltweit auf Konferenzen und an Universitäten über Islam und Menschenrechte gelehrt.
Präsentationen als Konferenzsprecher
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Council of National Policy (CNP) Conference, Plaza Hotel, Manhattan, 2004
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Florida Association of Hostage Negotiators (FAHN) Conference, Orlando, 2005
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U.S. Midwest Crisis Negotiation Team Conference, Columbus, Ohio, 2007
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International Counter Terrorism Officers Association Conference, San Antonio, Texas, 2008
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Austrian Business Men Association Conference, Vienna, 2009
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Muslim Christian Reconciliation Conference, Abidjan, Ivory Coast, 2012
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Swiss Business Men Conference, Winterthur, 2011
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Several Meetings of a Swiss political party in Switzerland, 2009 – 2011
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German business Men Association Meetings in Wolfsburg, Braunschweig, Augsburg, Madeburg, Kassel, 2011
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German Business Men Association Meetings in Aalen, 2011 and 2013
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Republican Women conference and Tea Party Conference in Savannah, Georgia, 2011
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SES Conference for Christian Apologetics, Matthews, North Carolina, 2013 and 2015
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Islam Conference in Matthews, North Carolina, 2015

Gastvorlesungen an Universitäten
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California State University, Los Angeles, California, 1998
- Purdue University, Wesst Lafayette, Indiana, 2002
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Uzusa University, Los Angeles, California, 2004
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Texas State University, San Marcos, Texas, 2005
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University of North West, St. Paul, Minnesota, 2005
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Michigan State University, Ann Arbor, Michigan, 2006
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SES, Matthews, North Carolina, 2007
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Handong University, South Korea, 2009
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University of Torino, University of Napoli and University of Florence, Italy, 2009