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WilliamsMarston LLC

We are an elite accounting advisory and management consulting firm comprised of top-rated former Big Four professionals.  We assist our clients with mission critical projects, accelerating their audit, reducing risk, saving them time and money while helping them to achieve their highest profile initiatives.  At a time when finance teams are stretched thin managing the day-to-day operations, we are the CFO’s trusted advisor for transformation and growth.




A $4.0 billion multinational public company needed assistance with creating a set of carve-out financial statements for one of its businesses.

Private Equity Services

A $250 million portfolio company of a private equity firm was at a critical juncture between pursuing a critical acquisition, integrating past acquisitions and timely financial reporting.

Process Improvement

A $1 billion telecom company with 1,500 employees experienced rapid growth over several years resulting in disparate systems and an inefficient cost structure.

Mergers & Acquisitions

A $250 million public company closed an acquisition of a multinational target requiring the preparation, conversion and audit of five legal entities’ financial statements.

Initial Public Offering

A foreign, private equity-backed biotechnology company founded in 2013 pursued an IPO in the U.S. with an accelerated timeline.

Interim Management

A $75 million software company needed an interim controller to immediately lead day-to-day operations and integrate a new acquisition’s finance function.

Technical Accounting

A $150 million public SAAS company needed assistance evaluating the impact of the new revenue standard.


A $700 million publicly traded print and marketing company with 3,500 employees filed for Chapter 11 bankruptcy protection.



Our Auditors raved that your purchase accounting work was fantastic!  They loved the thoroughness of the memo and said they have never seen work product that complete!  I am so happy to have selected WilliamsMarston to help us with this project!

Controller, Private Equity Portfolio Company

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

Senior Director of Finance, Public Company

“I cannot thank you enough for all your hard work and dedication on this mission critical project.  You have been an absolute pleasure to work with and your work has been more than excellent.”

Director of Revenue, Public Company

“I could not have made it through this process without the team from WilliamsMarston to field so many complicated issues.  You have been incredibly fantastic to work with, and I have 100% confidence in you. It’s been a pleasure to reach this personal and professional milestone with you.”

Chief Financial Officer, IPO Client

“Rock Stars! Worth Every Penny!”

Chief Financial Officer, IPO Company

“I am quite sure we had the most complicated preferred financing converting into common at the IPO than any other company.   We really appreciated your help, it made us look good and on top of the situation. We look forward to continuing to work with you, you guys do great work.  Thank you so much.”

Chief Financial Officer, IPO Client

“Our [National Office] reviewer called me to tell me they thought the memo was very well done.”

Audit Partner, Big 4


Landen C. Williams
Partner & Founder

  • 20+ Years of experience
  • Former Managing Director at KPMG
  • Former Managing Director at FTI Consulting
  • Former Audit & Advisory Manager at PwC

Phone: (617) 306-0951
Email: landen@williamsmarston.com

Jonathan T. Marston
Partner & Founder

  • 15+ years of experience
  • Former Director in PwC’s M&A practice
  • Former President of New England Standard Corp.
  • Former Senior Associate in PwC’s Audit practice

Phone: (617) 851-0891
Email: jon@williamsmarston.com

Michael R. Donoso
Managing Director

  • 10+ years of experience
  • Former Senior Manager at Celgene
  • Former Advisory Manager at KPMG
  • Former SEC Reporting Manager at Toys R Us

Phone: (646) 757-0572
Email: mdonoso@williamsmarston.com


1101, 2018

WilliamsMarston Announces the Promotion of Caitlin Rooney

WilliamsMarston LLC today announced the promotion of Caitlin Rooney to Manager in their Boston office.  Ms. Rooney joined WilliamsMarston

2509, 2017

WilliamsMarston LLC Relocates to Boston’s Financial District

WilliamsMarston LLC today announced the firm’s relocation of its Boston headquarters to the city’s Financial District. Located at 265 Franklin Street.

101, 2017

WilliamsMarston Announces the Promotion of Lynette Tsai

WilliamsMarston LLC today announced the promotion of Lynette Tsai to Manager in their Boston office.  Lynette joined WilliamsMarston in January


We work with some of the fastest growing and most dynamic companies in the world, providing the expertise and resources they need to succeed. Please contact us to find out how we can help your organization.