2011 July 2 Progress in recent RASC Dark-sky Preserves, RASC General Assembly, Winnipeg, Manitoba

2011 June 29 Jasper and Bruce Dark-sky Preserves, 4th International Dark Sky Parks Conference, Montsec, Spain

2011 April 29 Dark Sky Preserves, Sources of Knowledge Conference, Tobermory, Ontario

2010 Nov. 16 Urban Lighting With less Environmental Impact, Building Sustainable Communities Conf., Kelowna, BC

2010 October 15-16 Shoreline Lighting, The Land Between Research Forum, Fleming College, Halibuton, Ontario

2010 Sept. 7-10 Dark Sky Preserve Program in Canada, 3rd Symposium for Dark-Sky Parks Lastovo, Croatia

2009 Sept. 14-19 Canadian Dark Sky Preserves, 2nd Symposium for Dark-Sky Parks, Lastovo, Croatia

2008 July Right-of-way Lighting Policy for the City of Ottawa, Royal Astronomical Society of Canada, Annual Conference

2007 Sept. 19-21 Lobbying a Moving Target, International Darksky Association, Monte-Megantic, Quebec

2007 July Aerodynamics of Observatory Domes, Royal Astronomical Society of Canada, Annual Conference

2007 July Dark Sky Reserves and Preserves in Canada, Royal Astronomical Society of Canada, Annual Conference

2007 April 19-20 Canadian Dark Sky Initiatives, R.G.S.Bidwell, R.Dick, P.Goering and D.Welch, Starlight 2007, La Palma (Canary Islands)

2003 Sept. Reducing Urban Light Pollution, OPPI Conference

2003 Sept. Light Pollution Abatement Program, Ecology of the Night Symposium