Dear Multiphase Flow Colleagues,

We kindly invite you to give a presentation at this important anniversary of the International Journal of Multiphase Flow. The Journal has helped to establish, to strengthen and to grow our multiphase flow community and this event is an opportunity to meet and a way to further proceed in the future. The meeting will be in Vienna, Austria. International Journal of Multiphase Flow is also planning a special golden 50th Anniversary Issue, and you are invited to write a paper that will give you a chance to discuss your perspective on the development of the subject of your talk. We really hope to have you here.