The problem is mostly because "studio pottery" is pretty much any & all pottery that is hand made and the fact is, there are countless thousands of people who make or have made pottery, the majority of them unknown and certainly not famous, so, often is virtually impossible to identify who made it, when it was made and so on.
Today however, I was able to immediately identify the maker of a studio pottery vase I found in a local thrift shop. It is signed Marrero Puerto Rico. A quick Google search led me to a video on YouTube, featuring the artisan who made this pot, Hector Marrero.
Artisan Hector Marrero from Guaynabo Puerto Rico masters the art of wheel thrown ceramics