Anyone Familiar with David Martinez and Fintech Advisory?

Anyone here know much about David Martinez, the Mexican billionaire special situations investor?

From what I've read, he previously worked at the EM credit desk at Citi and then founded Fintech Advisory and built his reputation investing in distressed debt and special situations across Latin America, including several major sovereign and corporate restructurings. Despite his influence, there seems to be very little public information about him compared to other well-known investors.

Has anyone worked with him or Fintech, or been involved in a transaction where they were on the other side? Curious about his reputation and how Fintech actually operates.