- 1999 – Argonne National Laboratory, Chicago Illinois
- 2000 – Argonne National Laboratory, Chicago Illinois
- 2001 – canceled
- 2002 – Beaver Run Resort, Breckenridge, Colorado
- 2003 – Hotel Leon d’Oro, Verona Italy
- 2004 – Beaver Run Resort, Breckenridge, Colorado
- 2005 – Hotel Leon d’Oro, Verona Italy
- 2006 – Sheraton Burlington Hotel, Burlington Vermont
- 2007 – Le Majestic Conference Center, Chamonix France
- 2008 – La Fonda Hotel, Santa Fe New Mexico
- 2009 – Le Majestic Conference Center, Chamonix France
- 2010 – Doubletree Hotel Lloyd Center, Portland Oregon
- 2011 – Le Majestic Conference Center, Chamonix France
- 2012 – Rhode Island Convention Center, Providence Rhode Island
- 2013 – Hotel Araguaney, Santiago de Compostela Spain
- 2014 – Hyatt Regency Hotel, Atlanta Georgia
- 2015 – Grand Hotel Dino, Baveno Italy
- 2016 – The Hilton Torrey Pines, La Jolla California
- 2017 – Grand Hotel Dino, Baveno Italy
- 2018 – Philadelphia 201 Hotel, Philadelphia Pennsylvania
- 2019 – Sheraton Hotel, Porto Portugal
- 2020 – canceled
- 2021 – virtual
- 2022 – The Hilton Torrey Pines, La Jolla California