DAH stands for "Diseño de Asentamientos Humanos", and its appearance before the name, in typical Mexican fashion, refers to the fact that the person has a "licenciatura" in that subject. It's a variant of architecture.

"DAH. Israel Victoria Lona
Director General del Instituto Municipal de Planeación, Implan Mazatlán
Licenciado en Diseño de Asentamientos Humanos por la Universidad Autónoma Metropolitana"

http://forum.wordreference.com/showthread.php?t=1295579

Literally, then "human settlement design", but frankly I think you could omit "human", since it's really understood by default.

"Settlement" is the basic meaning of "asentamiento". You might think that here it would refer to designing homes, but in fact it does seem to refer to rural settlements, so I think "settlement" is the right word.

"Aquí cabe mencionar que el programa que ofrece la Universidad Autónoma Metropolitana, Unidad Xochimilco, es una versión actualizada de la Licenciatura en Diseño de Asentamientos Humanos. En este segundo grupo también es clara la preocupación por atender problemas vinculados a asentamientos humanos que no corresponden exactamente a lo conceptuados como “ciudades”, es decir, al desarrollo de comunidades “rurales”."
http://www.arquitectura.uady.mx/fauadyw/planhab.pdf

Some further references for the expression "settlement design":

https://www.google.es/search?num=100&lr=&cr=countryMX&hl=en&...

(While Taña was posting her references I was trying to decide how to translate it.)

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Note added at 22 mins (2013-07-10 13:27:38 GMT)
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Forgot the URL for my first reference:
http://www.mazatlaninteractivo.com.mx/new/imagenes2/stories/... (p. 50)

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Note added at 22 mins (2013-07-10 13:28:19 GMT)
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By the way, I'd use "graduate in" to evade the perennial problem of how to deal with "licenciado/licenciatura", since it is and yet is not equivalent to a bachelor's degree.