Just because someone has a lot of publications, does not mean you will be on them. I think that's an important thing to realize when applying to professors at any school. This person at Alliant may seem really active or prestigious because they themselves were a very good student or had a very good mentor. How many of the authors on those papers are student authors? In addition to match rate, funding, etc, you're also going to need to analyze how willing/often your POIs publish with students. I just glanced at this, but I see that the author publishes a lot with Eunice Chen (Faculty at Temple) and Marsha Linehan (Faculty at UW), Chavira (faculty at UCLA), McNally (I think faculty at Harvard). He went to UW, so it seems like he did a great job at networking and getting a lot of pubs and EXCELLENT research collaborators, but look at the dissertations he has chaired- I don't see any of those names coming up in the publications. You wanna get your hands on a pub and get authorship in a doctoral program!
If you're interested in staying close to CA and want to work on BPD-
Check out the clinical psych Ph.D.s at University of Texas, Austin- the researcher there (I forget her name), is studying BPD and starting to look at features in individuals under 18 or University of Washington- obviously Marsha Linehan. If you are willing to move away from CA, Rutgers located in New Jersey which is close to NYC if you're looking for a big city has Edward Selby and Shireen Rivzi (Rivzi?). Also, if you're interested in BPD, you can check out researchers that study emotion regulation, suicidality, or NSSI, as those are big components and their samples may or may not consist of BPD patients, but either way, it will be a similar experience with the emotion regulation piece.
Best of luck to you!