Russ Rosenzweig
Founder, Round Table Group — pioneer of expert witness networks
Russ Rosenzweig founded Round Table Group in 1994 and pioneered the modern expert witness network industry.
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Dr. Elena Marchetti
Estate Planning & Trust Law
Dr. Elena Marchetti has spent 25 years advising ultra-high-net-worth families on generational wealth transfer, dynasty trusts, and cross-border estate planning. Former partner at Whitcombe & Ross (New York and London), she has structured over $12B in trust assets, testified twice before the Senate Finance Committee on estate-tax reform, and authored two books: The Modern Dynasty Trust (2018) and Borders of Wealth (2022). She holds a J.D. from Yale, an LL.M. in taxation from NYU, and a Ph.D. in comparative trust law from Oxford. She is 62, based in Greenwich, CT, and teaches an annual seminar at Yale Law.
Marcus Oyelaran
Tax Strategy for Founders
Marcus Oyelaran, CPA, is a tax strategist for venture-backed founders and early employees. Over 22 years — first at Deloitte's National Tax practice, then as founding partner of Oyelaran Advisory (San Francisco) — he has structured more than $2B of founder liquidity events, with deep specialization in QSBS stacking, § 1045 rollovers, and multi-state exit planning. He is a frequent speaker at YC and the NVCA, contributes a monthly column to Founder Finance, and holds a B.S. in accounting from Howard and an M.S.T. from Golden Gate. He is 58 and lives in Oakland.
Sarah Chen, Ph.D.
Clinical Trial Design
Dr. Sarah Chen is a biostatistician and clinical trial methodologist. Over 28 years she has designed more than 60 pivotal trials across oncology, cardiology, and rare disease, served two terms on the FDA's Oncologic Drugs Advisory Committee, and led biostatistics at Regenex Therapeutics through three successful NDAs. She is currently Professor of Biostatistics at Johns Hopkins Bloomberg School of Public Health, holds a Ph.D. in biostatistics from Harvard, and has co-authored the widely used textbook Adaptive Designs in Confirmatory Trials (Springer, 3rd ed., 2023). She is 61 and lives in Baltimore.
James Halloran
Construction Defect Litigation
James Halloran, P.E., S.E., is a licensed structural engineer and full-time expert witness with 33 years of experience testifying on construction defect, means-and-methods, and building code disputes across 42 states. Founder of Halloran Forensic Engineering (Denver), he has been retained on more than 400 matters, including three high-profile parking-garage collapse investigations. He holds a B.S. in civil engineering from Purdue and an M.S. in structural engineering from Illinois, is a Fellow of ASCE, and served on the ACI 318 subcommittee for six years. He is 64 and splits time between Denver and a small farm in western Colorado.
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