Question: Who edited the 1521 edition of De Architectura?
About the article "Vitruvian Man", section "Derivative works".

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The "Vitruvian Man" has inspired a number of derivative works:
 Cesare Cesariano (1521) who edited the important 1521 edition of "De Architectura" of Vitruvius (Leonardo da Vinci is supposed to have provided the illustrations for this edition).
 Albrecht Dürer (1528) in his book "Vier Bücher von menschlicher Proportion" (four books on human proportions)
 Pietro di Giacomo Cataneo (1554)
 Heinrich Lautensack (1618)
 William Blake (1795) "Glad Day", now known as "Albion rose".
This representation is without the circle and square.
 The Italian 1 euro coin
Books published by Siberch included: The "Oratio" addressed to Cardinal Wolsey at Cambridge by Henry Bullock.
1521.
Augustine of Hippo's "Sermo de miseria ac brevitate hujus mortalis vitæ", 1521.
Lucian's "Opusculum περὶ διψὰδων", 1521, edited by Bullock, with his oration to Wolsey.
Baldwin of Forde's "Sermo de altaris sacramento", 1521.
Erasmus's "De conscribendis epistolis", 1521.
Galen's "De temperamentis", translated by Thomas Linacre, 1521.
John Fisher's "Contio", delivered on the day of the public burning of the writings of Martin Luther, translated into Latin by Richard Pace, 1521 .
Papyrius Geminus's "Hermathena", 1522.
Two leaves only, of an edition of William Lily's "De octo orationis partium constructione", were discovered in the library of Westminster Abbey. 
Cesariano is chiefly remembered as the first translator of Vitruvius' treatise "De architectura" into a modern language (Italian), with his added commentary.
It was published, with copious woodcut illustrations, at Como, 1521.
It contained 360 pages and was printed in 1300 copies.
It was soon plagiarized in editions published at Venice, but all were superseded by Daniele Barbaro's edition, with illustrations by Andrea Palladio, 1556.
Vitruvius' technical language is fraught with difficulties.
Leon Battista Alberti was of the mind that the Latins thought Vitruvius was writing Greek and the Greeks, Latin.
The impenetrable Latin and the lack of illustrations gave freedom to the Renaissance designers, who were able to interpret antique architecture in their own image, "all' antica".
Cesariano's Vitruvius gives us a clear picture of the Renaissance perception of the architecture of Classical Antiquity.
Indeed the spirit of Milan's Late Gothic Duomo can be recognized in some of Cesariano's woodcuts Among his illustrations is an attempt at rendering Vitruvius' precepts on the ideally proportioned man, successfully rendered by Leonardo, but attempted by many 15th century theorists [http://leonardodavinci.stanford.edu/submissions/clabaugh/history/othermen.htmlCesariano's illustrations, though not as influential as Sebastiano Serlio's, had some influence in the picturesque and classicizing vocabulary of the Northern Antwerp Mannerism. 
His book "De architectura" was rediscovered in 1414 by the Florentine humanist Poggio Bracciolini.
To Leon Battista Alberti (1404–1472) falls the honour of making this work widely known in his seminal treatise on architecture "De re aedificatoria" (ca.
1450).
The first known edition of Vitruvius was in Rome by Fra Giovanni Sulpitius in 1486.
Translations followed in Italian (Como, 1521), French (Jean Martin, 1547, English, German (Walter H. Ryff, 1543) and Spanish and several other languages.
The original illustrations had been lost and the first illustrated edition was published in Venice in 1511 with woodcut illustrations, based on descriptions in the text, probably by Fra Giovanni Giocondo.
Later in the 16th-century Andrea Palladio provided illustrations for Daniele Barbaro's commentary on Vitruvius (which appeared in Italian and Latin versions).
However, the most famous illustration remains a 15th-century one, Da Vinci's "Vitruvian Man".
The surviving ruins of Roman antiquity, the Roman Forum, temples, theatres, triumphal arches and their reliefs and statues gave ample visual examples of the descriptions in the Vitruvian text.
This book then quickly became a major inspiration for Renaissance, Baroque and Neoclassical architecture.
Brunelleschi, for example, invented a new type of hoist to lift the large stones for the dome of the cathedral in Florence and was prompted by De Architectura as well as viewing the many surviving Roman monuments like the Pantheon and the Baths of Diocletian in Rome. 
Cesare di Lorenzo Cesariano (1475 - 1543) was an Italian painter, architect and architectural theorist.
He authored the first Italian-language version of Vitruvius' "De architectura".