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


Prior to forming TTC, Geoffrey Cone founded the law practice Cone Marshall Limited (“Cone Marshall”), then known as Cone and Co., in Auckland, New Zealand in 1998. Cone continues to serve as Principal of Cone Marshall and practices in the area of trust and tax planning.

Cone began practicing commercial litigation as well as tax and trust advisory work in 1980. As Partner and Chairman of Partners at a leading Christchurch law firm, his tenure was marked by cases at all levels of the New Zealand courts as leading counsel and the Privy Council in London.

Later, Cone took his comprehensive litigation and advisory experience and further applied it by serving as a litigator in the British West Indies for two years. Cone graduated from University of Otago, Dunedin, New Zealand with an LLB and honours, and a Post Graduate Diploma in Tax and Trust law with distinction.

David Harris


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.

In 1987 David was appointed to the main board of NM Rothschild & Sons Limited in London. He also served as a director of many other Rothschild Group companies outside the UK and worked with senior members of the Rothschild family.  In the same year David was appointed the London CEO of the Rothschild Trust Group which became successful in Europe, the USA, Latin America, Asia and South Africa.

David became non executive in 2005 and was later appointed Chairman until his retirement in 2008.

Paolo Panico


Paolo Panico has experience in law and business as the Chairman of Private Trustees SA, an independent trust company based in Luxembourg. Panico, who speaks eight languages, is qualified as a solicitor in Scotland and as an “avocat à la Cour” in Luxembourg. 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 2017 Panico was appointed Chairman of the STEP Europe Region and he became a Council Member of STEP as January 1st, 2021. Panico is a member of the International Academy of Estate and Trusts Law (TIAETL), Vice Chairman of the International Tax Planning Association (ITPA), and a council member of the Italian Trust Society (Associazione “Il Trust in Italia”).

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


Douglas Barnes is an attorney and member of the New York Bar. He has a focus on corporate law practice on early-stage companies and technology-related transactions. 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). 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


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.

Abbie Flaherty


Abbie Flaherty has worked for the Cone Marshall Group since 2012. In early July 2019, she transferred from Cone Marshall Limited in Auckland, NZ, where she was a Legal Associate, to Teton Trust Company to take on the role of Director of Trustee Services. Abbie completed her conjoint degrees BA/LLB at the University of Canterbury in Christchurch, New Zealand, spending her final semester at the University of Copenhagen Denmark. Abbie is a Barrister and Solicitor in New Zealand where she holds a current practicing certificate and is a member of the New Zealand Law Society. Abbie is also a full member of the Society of Trust and Estate Practitioners. Abbie’s experience includes setting up and managing structures in both New Zealand and Wyoming, and providing advice on trusts, companies and limited partnerships.

David Bertsch


David Bertsch joined TTC as an Attorney and is licensed to practice law in Wyoming. He holds a Bachelor of Science from Penn State and a Juris Doctor from the University of Pittsburgh School of Law. David is also a published author.

Ivar Brock-Utne


Ivar Brock-Utne joined TTC 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.

Mattie Hagerty


Prior to joining TTC as an Administrative Assistant, Mattie Hagerty worked in Marketing and Operations. She holds a Bachelor of Arts in Literature from Sarah Lawrence College.

Nancy Sanchez


Nancy Sanchez joined TTC as an Administrative Assistant after working in Customer Service Management. Originally from Mexico, Nancy is bilingual in Spanish and English.

Ximena Rojas


Ximena Rojas joined our New York office in 2022 as a trust officer. Ximena is a Paraguayan finance undergraduate with a background in financial and economic research, as well as debt structuring. She holds an undergraduate degree in Finance from The American University in Washington, DC. Ximena is fluent in English, Spanish and German.

Maame Dufie Owusu


Maame Dufie Owusu joined our New York office in 2021 as a Junior Attorney. She is admitted to practice in the state of Missouri, with her New York bar admission pending. Dufie has both in-house and litigation experience in the areas of commercial real estate title and employment law respectively. Dufie holds a Bachelor of Science Degree in Justice Systems and Psychology, cum laude, from Truman State University. She also holds a Juris Doctor degree from the University of Missouri-Kansas City School of Law. Originally from Accra, Ghana, Dufie is fluent in English and Akan.

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