SEMI-RETIRED
This user is no longer very active on Wikipedia.
![](//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Fifteen_Year_Society_userbox.svg/42px-Fifteen_Year_Society_userbox.svg.png) | This user has been editing Wikipedia for more than 15 years. |
![](//upload.wikimedia.org/wikipedia/commons/thumb/6/67/Twenty_years_copyright_%28cropped%29.jpg/60px-Twenty_years_copyright_%28cropped%29.jpg) | This user supports the expiration of all copyright after 20 years. |
![](//upload.wikimedia.org/wikipedia/commons/thumb/b/bd/Turtle.svg/50px-Turtle.svg.png) | This user likes turtles. |
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ChaTo is my nickname. My real name is Carlos Alberto Alejandro CASTILLO Ocaranza (1977-). I was active as a Wikipedia editor mostly in 2005-2011, now I edit only occassionally.
I am Distinguished Research Professor at Universitat Pompeu Fabra in Barcelona, where I lead the Web Science and Social Computing research group.
I have published some peer-reviewed articles on Wikipedia:
More information is available on my Website www.ChaTo.cl.