According to TechFlow, Michael Gronager, co-founder and CEO of blockchain analysis company Chainalysis, has left his leadership position after ten years in the position, according to The Block.

A Chainalysis spokesperson confirmed that Gronager has been on “leave” since September 25 due to “personal issues.” It is unclear if or when Gronager plans to return. Chainalysis President and COO Sari Granat will serve as interim CEO, the spokesperson said.