Dissertations and theses can be found in a various databases. However the most comprehensive place to look is:
Once you know of a masters' thesis or PhD dissertation you want to read, how do you get a copy?
Typically, masters' theses and PhD dissertations can be found at the college/university library where the graduate student (author) received their degree.
UMass Boston theses are listed in UMBrella. Search the catalog by author, title of thesis, or by typing into the search box exactly this: University of Massachusetts at Boston Theses.
For non-UMass Boston theses & dissertations, just follow these steps: