The University of Jena, Germany, and the New York State College of Ceramics at Alfred University, in the USA, are among the most specialized and traditional centers in glass science.

The Federal University of Sao Carlos, in Brazil, also offers very equipped facilities, if you prefer a tropical country.

Of course, there are a lot of other good institutions... it depends on the subject you are interested in within the topic of glass chemistry. For example, if you want to research Bioactive Glasses, the Imperial College London has nice researches in this field.