GoldenTree’s Tananbaum sues Jeff Koons, Gargosian Gallery, claims Ponzi scheme Posted on April 19, 2018 at 5:10 pm. GoldenTree Asset Management’s founder and chief investment officer Steven Tananbaum, who is also a well-known art collector and trustee [Read More]To access this content, you must be a member. Visit the Plans page for details.