To hold an international conference on nonlinear analysis and convex analysis jointly is very important for development of mathematical science and its related area all over the world. During the last three decades, the study of Nonlinear Analysis has been devoted vigorously and such activity had great influence on other areas of science as much as mathematics. At the same time, Convex Analysis has grown in connection with the study of problems of optimization, equilibrium, control, and stability of linear and nonlinear systems. These two mathematical disciplines have no border and they rather have good effects each other. Based on this idea, we had the following meetings of the International Conference on Nonlinear Analysis and Convex Analysis.
     
 NACA2015  Rimkok Resort Hotel, Chiang Rai, Thailand
January, 21 -25, 2015
 NACA2013  Hirosaki University, Hirosaki City, Aomori, Japan
August 2 - August 6, 2013
 NACA2011  Pukyong National University, Busan, Republic of Korea
August 2 - 5, 2011
 NACA2009  Tokyo Institute of Technology, Tokyo, Japan
March 27 - 31, 2009
 NACA2007  National Tsing Hua University, Hsinchu, Taiwan
May 31 - June 4, 2007
 NACA2005  Okinawa Convention Center, Ginowan City, Okinawa, Japan
June 30 - July 4, 2005
 NACA2003  Tokyo Institute of Technology, Tokyo, Japan
August 25 - 29, 2003
 NACA2001  Hirosaki University, Hirosaki City, Aomori, Japan
July 30 - August 2, 2001
 NACA1998  Niigata Washington Hotel, Niigata City, Japan
July 28 - 31, 1998
 
    In the closing ceremony of NACA2009, we had the inaugural assembly for a virtual academic society on Nonlinear Analysis and Convex Analysis and we adopted a new idea to establish the International Research Working Group in Nonlinear Analysis and Convex Analysis. This association has Steering Committee, Executive Director, Scientific Committee, and two biennial meetings - International Conference on Nonlinear Analysis and Convex Analysis (NACA) and Asian Conference on Nonlinear Analysis and Optimization (NAO-Asia). Professor Wataru Takahashi (Japan) is elected to the chair of the steering committee.