Dimitry Olevsky is an excellent violin teacher whose style and insight as a teacher can and certainly will lead to many top adult violin players in the years ahead. I say that from the perspective, not only of my current 13-year old, who is studying under him after having taken less inspiring lessons elsewhere, but also from memories of years past when my now much older adult daughter took violin lessons as a middle and high schooler. And indeed from my own perspective taking serious music instrumental lessons (not on violin) decades ago.
Having said the above, Dr. Olevsky will be most successful with students who have an internal drive and desire to better themselves as a musician. He can be severe and critical in pointing out areas where his students' techniques and musical interpretation need improvement, and he is excellent in both aspects of this guidance.
A lesson sequence is serious business, and Dr. Olevsky can be severely critical if the circumstances call for this. Lesson time is not given to frivolity, and students must be able to accept criticism.
A non-self motivated student may falter under his guidance -- unless the process of becoming better leads to increased dedication. I.e., the non-dedicated student may find the pressure to improve more than he or she might like, and the lesson criticism and demonstration of specific ways to improve may lead to discouragement. This is more likely to happen if the student does not act on suggested improvements during practice at home between actual lessons.
I highly recommend Dr. Olevsky for students dedicated to learning seriously.