paragraph: From 1512, Maximilian I became Durer's major patron. His commissions included The Triumphal Arch, a vast work printed from 192 separate blocks, the symbolism of which is partly informed by Pirckheimer's translation of Horapollo's Hieroglyphica. The design program and explanations were devised by Johannes Stabius, the architectural design by the master builder and court-painter Jorg Kolderer and the woodcutting itself by Hieronymous Andreae, with Durer as designer-in-chief. The Arch was followed by "The Triumphal Procession", the program of which was worked out in 1512 by Marx Treitz-Saurwein and includes woodcuts by Albrecht Altdorfer and Hans Springinklee, as well as Durer. Durer worked with pen on the marginal images for an edition of the Emperor's printed Prayer-Book; these were quite unknown until facsimiles were published in 1808 as part of the first book published in lithography. Durer's work on the book was halted for an unknown reason, and the decoration was continued by artists including Lucas Cranach the Elder and Hans Baldung. Durer also made several portraits of the Emperor, including one shortly before Maximilian's death in 1519. 
question: Who devised the design program and explanations for The Triumphal Arch?
answer: Marx Treitz-Saurwein