It is with immense sadness to learn that Dr. Hosein Pazandeh passed away. He was a pioneering scholar who made inspiring contributions to the field of chemical engineering. But more importantly, he was a wonderful person who generously extended numerous acts of kindness and provided exceptional mentorship to countless students and colleagues. He will be greatly missed by his family, current and former scholars, staff, and students in the School of Chemical Engineering, College of Engineering at the University of Tehran. May he rest in peace and may his family, friends, colleagues, and students have the patience to deal with this tremendous loss.