The 12th International Conference on Gas–Liquid and Gas–Liquid–Solid Reactor Engineering (GLS-12) will be held in New York City from June 28 to July 1, 2015, following the success of the eleven previous conferences which were held in Columbus, OH, USA (1992), Cambridge, UK (1995), Kanazawa, Japan (1997), Delft, The Netherlands (1999), Melbourne, Australia (2001), Vancouver, Canada (2003), Strasbourg, France (2005), New Delhi, India (2007), Montreal, Canada (2009), Braga, Portugal (2011) and Seoul, South Korea (2013).