About Us

Our Story

WilliamsMarston is a national leader in complex accounting, tax, and valuation services advising pre-IPO, public, and private equity-backed companies managing rapid growth and transformation. Our team of industry leading experts pair Big Four experience and strong technical expertise with the passion, talent, and drive to deliver successful outcomes in the most challenging situations.

The firm 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, our advisory firm quickly landed projects helping a biotechnology company and a software company to prepare for their initial public offerings.

In May 2014, we hired our first full-time employee and moved into a modest office. In 2016, we opened our New York office and appointed a New York market leader. As we grew, our service offerings expanded to include technical accounting, mergers and acquisitions, divestitures, private equity services, interim management and restructuring.

Accelerating the Growth of Our Advisory Firm

In November 2020, we acquired a highly respected corporate tax advisory practice, adding significant expertise in complex income tax accounting to our capabilities. In December 2021, we acquired a nationally recognized leading provider of complex valuation advisory services related to financial reporting, tax reporting, litigation support, solvency and fairness opinions.

To date, our advisory firm has completed five acquisitions, accelerating our evolution into a national leading provider of complex accounting advisory, tax and valuation services to companies managing rapid growth and transformation. Today, we have more than 200 professionals and 1,000 clients with offices in Boston, New York, Denver, Tucson, Dallas, Atlanta, Los Angeles and the San Francisco Bay Area.

We’re Committed to Your Success

Every day, our team delivers the expertise, talent and drive to ensure our clients achieve their most mission critical initiatives. Our clients include many large multinational public companies as well as private equity-backed and pre-IPO growth companies. Contact us if you’d like to learn more about us or how we can assist your organization.

"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

Our purpose is to deliver what matters by being a firm where great people collaborate among our team and with great clients on great engagements.


Act with Integrity
Put Clients First
Work as a Team

Our Founders

Join Our Team

At WilliamsMarston, we take success personally. We champion everyone by recognizing the value in what they are working to do and the meaning it has for them professionally and personally. This is a place where strong expertise and genuine investment come together to create opportunities to learn continuously, work with purpose, and develop a fulfilling career alongside other high EQ, high-caliber people. Start your journey with us today.