Management Team

Derrell Hendrix
Derrell is the CEO of Karson Management (Bermuda) Limited and its subsidiaries, which he founded in 2007. Through his work at Karson and at The RISConsulting Group, a company he co-founded with Hannover Re and Rabobank in 1996/97, Derrell has developed a unique profile in the complex financial risk management area, working with major corporations, financial institutions and regulators. Prior to RISConsulting, Derrell spent just under 20 years at Citibank, where he held senior positions in relationship management, fixed income and equity derivatives as well as securities trading and structuring in Canada, Hong Kong and London.  He created Citibank’s European warrants business, its European equity derivatives and insurance derivatives businesses, and concluded the first catastrophe bond transaction for Hannover Re in 1994. Derrell served as a member of the Board of Directors of Converium AG from its launch in 2001 until its acquisition by SCOR in 2007.
Derrell received a B.A. (Magna cum Laude) from Amherst College and an M.A. from the Fletcher School of Law and Diplomacy.


Richard Black
Richard is the Bermuda Director and CFO of Karson Management (Bermuda) Limited and its subsidiaries. Since coming to Bermuda in 1981, Richard has held various senior positions at AIG, Pinnacle Re, Centre Re, Stockton Re and Wind River Re. Richard is also a Director of various other Bermuda companies, including The Shipowners Insurance & Guaranty Company, affiliates of Thomas Miller and affiliates of Macquarie Bank.
Richard is a member of the Institute of Chartered Accountants in England & Wales


Jeffrey Tretin
Jeffrey serves as General Counsel for the Karson group of companies. Jeffrey had worked as a tax practitioner at law firms in New York.  He joined The Continental Insurance Company as domestic tax counsel in 1987 and served as a Senior Manager and Director of the Insurance Tax consulting practices at Ernst & Young and PWC from 1994 through 1998.  He joined Converium in 1998 as Senior Vice President/Underwriting in the Risk Strategies Division.
Jeffrey is a graduate of Brandeis University and received his JD from The Columbia University School of Law and his LLM in Taxation from the New York University School of Law.

Andrew Seem (RISConsulting)
Andrew joined The RISConsulting Group LLC in 1998 and is a Managing Director.  Since the inception of Karson Management (Bermuda) Limited in 2007, Andrew has been providing a variety of services to the Karson group pursuant to its service agreement with RISConsulting. Andrew has been instrumental in the origination, structuring and distribution of a variety of transactions including life reinsurance securitizations, catastrophe bond transactions, reserve and capital financing transactions.  He has also served as project manager for the launch of specialist structured finance vehicles.
Andrew received an M.B.A. from Boston University and a B.A. from Denison University.
John I. Williams, Jr.
John is Director and Vice President of Karson Management (Bermuda) Limited.  He has extensive experience in service delivery as a banker, senior financial services executive and consultant.  He was a VP/Group Head at Chemical Bank’s Operations Division.  He went on to hold several senior positions at American Express, including SVP of Strategic Planning, VP of Platinum Card (US), SVP of Marketing Information Services, and SVP/GM of the Consumer Travel Network.  He led a re-positioning of the Platinum Card, where he created a number of new, innovative service features that led to accelerated growth for the product.  He restructured the Consumer Travel Network, leading to a quintupling in operating income over three years.  He has served as CEO of three startup ventures, as a partner in the Bridgespan Group, a strategy consulting firm, and as president of Muhlenberg College (PA).  John is a director of Karson (Bermuda) and Linear Air, Inc.  In addition, John is a Life Trustee of Amherst College and serves as a trustee of Kent School (Kent, CT) and Walnut Hill School for the Arts (Natick, MA).
John earned a BA, magna cum laude, in Economics from Amherst College.  He holds an MBA from Harvard Business School and a JD from Harvard Law School.


Christopher Yoshida
Christopher is a Director and Executive Vice President of Karson Management (Bermuda) Limited and has more than 2 decades of global market, asset management and entrepreneurial experience. He is the President and CFO of Northern Data, Europe’s Leading HPC Infrastructure provider. Before joining Northern Data, Mr. Yoshida was a Senior Advisor to Global Credit and the Head of Carlyle Capital Solutions Europe (CCS), at the Carlyle Group based out of London. Mr. Yoshida has spent over 16 years before this in leadership and management positions at Deutsche Bank, Morgan Stanley and Goldman Sachs.

In addition, we employ the services of expert consulting firms:


DSFR – Harry Scheule 
Harry has extensive expertise in the area of banking, credit and liquidity risk, data analytics, housing finance, insurance, portfolio construction, prudential regulation and securities valuation. Harry is a strategic partner for financial institutions and fund managers, who have applied his economic and regulatory frameworks globally to improve their risk management practices or manage and transfer financial risks.
Harry’s award-winning research has been widely cited and published in leading journals. His textbooks on credit risk analytics are used around the world in data analytics courses. He currently serves on the editorial board of the Journal of Risk Model Validation.