Diane Seymour-Williams
Profile Verified by The Marque
Last Updated: 22 Sep 2026
Founding Partner
London, GB
Profile Verified by The Marque
Last Updated: 22 Sep 2026
THE MARQUE
In Their Own Right
Biography
Diane holds board and advisory positions across wealth tech, private equity and venture capital, including publicly listed Patria Private Equity Trust and Mercia Asset Management plc and SEI ( Europe), a subsidiary of a c.$10bn Nasdaq listed company.
She has vast experience across the investment management industry as a leader and practitioner in global boutiques and also larger firms. Diane started her career as a portfolio manager, became CIO and subsequently as a CEO, building businesses, structuring funds and leading distribution and client teams.
Following executive positions focused on public markets and extensive international experience, particularly in Asia, Diane’s plural career now leans towards private markets. In addition to her NED positions, she is an independent member of the Valuations Committee for Chrysalis Investments Limited.
Diane is a pro bono member of the investment committees of Newnham College, Cambridge and the Canal & River Trust.
The Record
Background
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2018 — Present
Founding Partner
Acorn Capital Advisers
Diane is a Founding Partner at Acorn Capital Advisers, an independent wealth management adviser to family offices and UHNWI.
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2007 — 2016
Director & Global Head of Relationship Management
LGM Investments
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1981 — 2005
CEO, CIO, Director
Morgan Grenfell Asset Management
Diane worked for Morgan Grenfell/Deutsche Asset Management for over 23 years in both Singapore and London. Her last roles at the company were Head European Client Relationships and Head Global Equity Product.
In The News
Newsfeed
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6 June 2022 · MarketScreener
Chrysalis Investments Limited Announces New Independent Valuation Committee
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24 October 2021 · Financial Times
Navigating the thicket of ESG metrics
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6 October 2021 · Jersey Finance
Family Office Feature: In Conversation With Diane Seymour-Williams
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Formative Years
Education
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University of Cambridge
MA Economics
Areas Of Focus