Wolfgang Krull (1899-1971) - continuing the tradition of Felix Klein and Emmy Noether - is world famous for his contributions to the area of mathematics now known as abstract commutative algebra. With a few exceptions, these two volumes contain all papers of Krull published in mathematical periodicals. Volume 1 covers the period 1921 to 1938, beginning with Krull's 1921 Freiburg dissertations and ending with the 1938 landmark paper published in Crelle, in which he initiated the theory of local rings. Volume 2 contains all the papers published between 1939 and 1973. This edition seeks to demonstrate the breadth and depth of Krull's mathematical work and his lasting influence. Also included are essays by P. Ribenboim, H. Schoneborn, H.-J. Nastold and J. Neukirch setting Krull's work in perspective.