Chemical engineering

Chemical engineering, like everything else in the world, is changing. One of the signs of its change is the recent appearance of several Festschrift publications commemorating the birthdays of a few exceptional people who, as everyone sees and acknowledges, have done so much to lead our profession forward to the advanced position it enjoys today. Chemical Engineering Science has produced festival issues for P. V. Danckwerts and N. R. Amundson, and now, on the occasion of his 60th birthday, it is time for us to honor another giant of the profession: Rutherford Aris.