WilliamsMarston hires Marcello Castellano as finance-as-a-service head

WilliamsMarston, a Boston-headquartered accounting and consulting firm, has hired Marcello Castellano as a partner and head of the newly launched finance-as-a-service (FaaS) practice.

Based in the firm’s headquarters, Castellano will oversee a new practice that delivers end-to-end finance and accounting capabilities via a tech-enabled platform model.

The FaaS practice will support high-growth and early-stage companies with a full outsourcing model for operational and strategic finance and accounting capabilities.

“As companies continue to look for more efficient and scalable ways to build their finance functions, our Finance as a Service practice will provide clients with the capabilities, infrastructure, technology, and support they need at each stage of growth. We are excited for the impact Marcello will make in this new role,” said Sanjay Ramaswamy, CEO of WilliamsMarston.

Castellano brings more than two decades of experience advising clients on finance, accounting, and business transformation. He rejoins WilliamsMarston after five years as a managing director at Browne Consulting Group. Before that, he spent four years with WilliamsMarston as a managing director and nearly two years as client service CFO at Charles River CFO.

Earlier in his career, Castellano was a finance officer at the UN’s Food and Agriculture Organization and a director in PwC’s transaction services practice.

He has a bachelor’s degree in accounting and finance from UMass Amherst.

“High-growth businesses need strong finance and accounting capabilities, but they do not always need or are not always able to build a full internal function right away,” Castellano said. “FaaS, with the right foundation of AI-enabled technology, gives them a model that can grow alongside them while also providing the rigor and support they need to operate with confidence.”

WilliamsMarston was founded in 2014 and has more than 250 professionals across 10 US offices. The national firm provides accounting, tax, valuation, and transaction advisory services to pre-IPO, public, and private equity-backed companies.