This volume contains the proceedings of the David Robertson Honorary Symposium: Celebrating the Megascale, held at the TMS 2014 Annual Meeting in San Diego, California. Dr. David G.C. Robertson, Professor Emeritus of Metallurgical Engineering at the Missouri University of Science and Technology, has devoted his career to the education of highly skilled metallurgical professionals and to the science of all types and sizes of metallurgical processes, particularly those involving molten metals.The volume contains more than 70 papers covering the important topics and issues in metallurgy today including papers as follows: keynote papers covering a tribute to Robertson, workforce skills needed in the profession going forward, copper smelting, ladle metallurgy, process metallurgy and resource efficiency, new flash iron making technology, ferro-alloy electric furnace smelting and on the role of bubbles in metallurgical processing operations. Topics covered in detail in this volume include ferro-alloys, non-ferrous metallurgy, iron and steel, modeling, education, and fundamentals.