I maintain a listing in Spanish with some the posters and slides and other related material of presentations I have given in conferences, workshops, seminars and other such events; many of them are in English, although not all. If you saw me present something somewhere but cannot find it here, send me an e-mail and I will dig up a version to send you.
Feel free to reuse any; just mention that you copied it from me. I will also be happy to assist in praparing slides and posters, should you see something you'd like to reproduce but don't know how.
Updated on October 7, 2016.