Who We Are

Teton Trust Company (TTC) is a state chartered trust company based in Jackson Hole, Wyoming. The board of the trust company is comprised of lawyers and trust professionals with decades of trust administration experience. Teton Trust Company is part of a group that has experts in multi-generational family trusts and planning. Teton Trust Company works with clients across the globe.

Who We Are

TTC was founded by Geoffrey Cone, the Principal and founder of Cone Marshall Limited, an international trusts and estates planning law firm. The Teton Trust Company team has over two decades of experience in establishing, migrating, and administering trusts worldwide.

Jackson Hole, in Wyoming’s Teton County, is one of the wealthiest (and most beautiful) locations in the United States. Over decades, this county has grown a significant financial services industry for resident high net worth families.

With a stable (and business-friendly) state government, no state income taxes, progressive trust laws, and an efficient judiciary experienced in trust issues, Wyoming is the premier trust jurisdiction in the U.S.

Teton Trust Company is pleased to be a Wyoming chartered trust company.


Geoffrey Cone, President

President and Treasurer of the Board of Directors

Prior to forming Teton Trust Company, Geoffrey Cone founded the law practice Cone Marshall Limited (“Cone Marshall”) in Auckland, New Zealand in 2007. Cone continues to serve as Principal of Cone Marshall and practices in the area of trust and tax planning. Previously, Cone was the Director and sole proprietor of Cone and Co. from 1998 until the company was transferred to Cone Marshall Limited in 2007. Before Cone and Co., Cone practiced in New Zealand, specializing primarily in commercial, tax and trust litigation. Cone graduated from University of Otago, Dunedin, New Zealand with an LLB and honors, and a Post Graduate Diploma in Tax and Trust law.

David Harris

Chairman, Board of Directors

David Harris has over 40 years of practical experience in both law and investment banking, specializing in UK private and international business clients, as well as public companies. Early in his career, he practiced law for 12 years and became a partner in the London law firm of Nabarro Nathanson focusing upon taxation and property law.

After leaving Nabarros in 1982 he joined NM Rothschild & Sons Ltd., London investment bankers, where he pioneered the development of the Bank’s international trust business and lead this for the next 26 years. In 1985 he became a Fellow of the Institute of Taxation by thesis on the taxation of private companies.

David was appointed as main board director of Rothschilds in 1987 which included the divisions of banking, corporate finance and asset management. At the same time, he was also appointed Chief Executive Officer (and ultimately Chairman in 2006) of Rothschild Trust Corporation Limited with key members of the Rothschild family in London. This company supervised the Rothschild Trust Group operations worldwide. He also sat on the boards of the Group’s Swiss trust companies in Zurich and worked with Rothschild & Cie in Paris as well as Rothschild Inc. in New York.

During his time at Rothschilds, David developed the Group’s international trust and fiduciary business in Europe, the USA, Latin America, Asia and South Africa using international financial centres as well as onshore locations such as Canada, New Zealand and the UK.

Paolo Panico

Member, Board of Directors

Paolo Panico has significant experience in law and business as the Chairman of Private Trustees SA, an independent and regulated trust company based in Luxembourg. Panico, who speaks eight languages, is qualified as a solicitor in Scotland and as an avocat in Romania, and on such basis is a member of the Luxembourg Bar. He also serves as an adjunct law professor at the University of Luxembourg and the University of Liechtenstein, where he teaches international and comparative trust law.

In May 2016, Panico was appointed Deputy Chair of STEP, Benelux branch, and he had served as Treasurer of the Milan branch from 2006 to 2010. In February 2013 Panico was admitted to the International Academy of Estate and Trusts Law (TIAETL). He has been a member of the Committee of the International Tax Planning Association (ITPA) since 2012 and was appointed Deputy Chairman in 2015. Panico is a member of the Italian Trust Society (Associazione “Il Trust in Italia”) where he served as council member from 2008 to 2011.

His publications include: Private Foundations. Law and Practice (Oxford University Press, 2014) and International Trust Laws (Oxford University Press, 2010; second and entirely revised edition, 2017).

Douglas Barnes

Member, Board of Directors

Douglas Barnes is an attorney and member of the New York Bar. He has a corporate law practice focused on early stage companies and technology-related transactions, including a wide variety of transactions relating to the purchase and sale of technology and services in the financial sector. Before embarking on a career in law, Barnes had a fifteen-year career in the IT field that progressed from developing banking and accounting software to co-founding the security software company C2Net (now part of Red Hat), was VP of Consulting at Securify and co-founded IO.com, one of the first commercial Internet Service Providers. Prior to launching his own law firm in 2015, Barnes practiced corporate and technology transactions law at Sullivan and Cromwell, Milbank, and Gibson Dunn. Barnes grew up very close to Wyoming, in Fort Collins, Colorado, and maintains close connections to the area. Barnes received his J.D. from the University of Texas School of Law and also has a B.S. in Computer Science from Colorado State University and a B.A. in Humanities from the University of Texas at Austin.

Katrina Robinson

Member, Board of Directors, Company Secretary

Katrina Robinson is responsible for business operations in the U.S., business development, and acting as a liaison with the Cone Marshall group. Robinson is an attorney admitted to practice in New York. She has worked with family offices and private clients. Prior to law school, she worked as a portfolio manager with an international wealth management team at the Royal Bank of Canada in New York City. Originally from Kingston, Jamaica, she is a graduate of Princeton University, University of Cambridge and Cardozo School of Law. She speaks Spanish and Portuguese.

Martin Calatrava

General Manager

Martin has worked with the Cone Marshall group since 2013, and most recently transferred to the group’s U.S. office, Teton Trust Company, in March 2018. Previously, he was Director at Cone Marshall’s office in Geneva, involved in wealth planning matters, including trusts and estate planning for high net worth individuals.  Originally from Argentina, Martin graduated from law school at the University of Buenos Aires, and further studied trusts law in New Zealand where he became a member of the Society of Estate and Trusts Practitioners. In June 2017, he finished a two-year program LLM in International Tax at the Vienna University of Economics and Business.  Martin speaks Spanish, Italian, and English with native proficiency.

Zane Aukee

Trust Officer and Legal Associate

Zane Aukee joined Teton Trust Company as a Legal Associate and Trust Officer. He is an attorney admitted to practice in Wyoming, New York, and Montana. In addition to a JD and MBA from the University of Montana, Zane holds a Bachelor of Arts in Classics from the University of Michigan.

Ivar Brock-Utne


Ivar Brock-Utne joined Teton Trust Company as an In-House Accountant. He is an active CPA in Wyoming with significant experience in bookkeeping, taxes, and financial modeling.  Ivar holds a Master of Accounting degree from the University of Southern California and a Bachelor of Science in Economics from Saint Mary’s College of California.

Brynn Powell

Administrative Officer

Brynn Powell joined Teton Trust Company as an Administrative Officer.  Brynn holds a Master of French Studies from the University of Wisconsin-Madison, and a Bachelor of Arts in French from Skidmore College. Given her advanced studies, and having spent significant time in France, she is fluent in French.