Firm Overview

Our Story

WilliamsMarston LLC (the “Firm” or “WM”) was founded in Boston in 2014 by two former Big Four professionals who believed that middle-market companies, their investors, and lenders were underserved in the accounting advisory space. Initially working out of coffee shops and restaurants, the Firm quickly landed projects helping a biotechnology company and a software company to prepare for their initial public offerings.

In May 2014, WM hired its first full-time employee and moved into a modest office. In 2016, the Firm opened its New York office and appointed a New York market leader. As WM grew, its service offerings expanded to include technical accounting, mergers and acquisitions, divestitures, private equity services, interim management and restructuring. In November 2020, WM acquired a highly respected corporate tax advisory practice, adding significant expertise in complex income tax accounting to its capabilities. In August 2021, WM completed the acquisition of Chord Advisors, a firm of more than 30 professionals, including many former Big Four national office and former FASB staff members, with specialized expertise in IPO readiness, SEC reporting and complex technical accounting. In December 2021, WM acquired Bay Valuation Advisors, a nationally recognized leading provider of complex valuation advisory services related to financial reporting, tax reporting, litigation support, solvency and fairness opinions.

Today, WilliamsMarston has more than 140 professionals and 1,000 clients with offices in Boston, New York, Denver, Dallas, Southern California and the San Francisco Bay Area. The Firm’s clients include many large multinational public companies as well as private equity-backed and pre-IPO growth companies. Although WM has grown significantly over the years, our founders still fondly recall their first office and first few client wins, many of which remain loyal clients of the Firm today. If you’d like to learn more about us or how we can assist your organization, please contact us. You can also follow us on LinkedIn for our latest updates and developments.

I continue to be impressed and grateful with the level of attention and technical expertise your team consistently provides.

Senior Finance Director

Public Company

Our Mission

We believe the most talented people are attracted to the most challenging problems in their field. Our mission is to build an advisory firm of the most talented people solving the most complicated problems.


Act with Integrity
Put Clients First
Work as a Team
Embrace Meritocracy
Learn Continuously

Our Founders

Landen C Williams

Landen C. Williams

Managing Partner

Jonathan T Marston

Jonathan T. Marston

Managing Partner

Join Our Team

A career with WilliamsMarston provides you with hands-on experience, solving issues that matter. You will build a diverse skillset to quickly advance your career. Explore available positions with our advisory firm today.