Firm Overview

Our Story

WilliamsMarston LLC was founded in Boston in January 2014 by two former Big Four professionals, who believed that middle-market companies, their investors and lenders were underserved in the accounting advisory firm 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, WilliamsMarston 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 leader. As the firm grew, its service offerings expanded into mergers and acquisitions, divestitures, private equity services, interim management, and restructuring. In November 2020, WilliamsMarston acquired a well-known and respected boutique tax firm adding significant expertise in income tax accounting to its service capabilities. Today, WilliamsMarston has more than 50 professionals and serves more than 300 companies in a variety of industries including multinational public companies, market-leading private equity firms and many other growth companies.

Although the firm has established larger offices over the years to accommodate its growing team, 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 our firm on LinkedIn for updates and to connect with our team.

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

Managing Partner

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.