Nancy Salzman [historical timeline].
https://www.foxnews.com/us/nxivm-cult-leader-coerced-women-into-sex-branded-initials-on-his-slaves-authorities-say
Salzman has been an influential figure in the organization since it was set up more than two decades ago. She also was involved in some of the medical research studies that were performed by a doctor associated with NXIVM, Brandon B. Porter.
https://www.timesunion.com/news/article/Feds-raid-home-of-NXIVM-co-founder-Nancy-Salzman-12784322.php