The Blackfriars Summa Theologiae, 60 volumes between 1964 and 1976, the greatest collective scholarly achievement of the English Dominican Province, was conceived and orchestrated by Fr Thomas Gilby. To what school of 20th century Thomism did he and his collaborators owe allegiance, if any? This paper considers that question while documenting some of the significant influences on Gilby and his collaborators on his translation of Aquinas's Summa.