Pamda, according to an article found on CruiseMates (a Usually Reliable Source) published September of 2000, it was Ricardo Gracia of Barcelona, Spain who invented the Pina Colada in 1951 at the Caribe Hilton in San Juan. Mind you, I didn't know that, it just showed up when I plugged in Pina Colada +original into a Google search, and the Cruisemates link showed as the first web page match!
The Caesar Salad is attributed to Caesar Cardini and was invented in 1924 in Tijuana when Senor Cardini wanted to take some of the load off a busy kitchen by having the prep work done tableside. Controversy still reigns, but purists say no anchovy was present in the original recipe.
Now, who invented the Lima bean... and why???