Looking For Advocates With Experience Or Knowledge On "gaslighting"

Looking to speak to advocates who has specifically dealt with cases on "gaslighting", or at least who has a 'very deep' knowledge about gaslighting and its dynamics. Expertise specifically on gaslighting is highly desirable, however, "narcisstic abuse" might also work. If not, advocates with a good background in Western psychology (psycho-legal experts) is alslo viable.