Ilya Lichtenstein, 34, and his wife, Heather Morgan, 31, are accused of laundering billions in stolen cryptocurrency.

Lichtenstein, a tech entrepreneur who goes by the nickname “Dutch,” was born in Russia, and his family emigrated to the United States to avoid religious persecution, settling in suburban Chicago. He studied at the University of Wisconsin at Madison and co-founded MixRank, a sales firm initially funded by Y Combinator and investors, including Mark Cuban, according to the company’s website. He described himself as a “tech entrepreneur, explorer, and occasional magician” in a 2018 blog post.