Finance and tax specialist joins Cooley

International Tax Review is part of Legal Benchmarking Limited, 1-2 Paris Garden, London, SE1 8ND

Copyright © Legal Benchmarking Limited and its affiliated companies 2026

Accessibility | Terms of Use | Privacy Policy | Modern Slavery Statement


Finance and tax specialist joins Cooley

corcoran-william-90x90

William Corcoran has joined Cooley's tax practice as the first tax partner in its Boston office.

Celebrating 10 years since the firm launched in the city, Corcoran's arrival follows that of partner Ryan Sansom who joined in March. 

Corcoran has a lot of experience in private equity and venture finance tax matters. He advises on the federal and state income tax consequences of corporate and partnership mergers and divisions and represents leveraged buyout, venture capital, mezzanine and other alternative investment vehicles on formation and investment issues. 

Before joining Cooley, Corcoran was a partner at Osler, Hoskin & Harcourt for 12 years. He previously worked at Goodwin, Wilmer and was a partner at Testa. 

more across site & shared bottom lb ros

More from across our site

The arrivals of Julio Castro and Adam Blakemore mean the firm has added six tax partners to its global practice since the start of 2025
Tax authorities have gained unprecedented transparency through CbCR, but a new study suggests they may not be looking in the right places
The future chief tax officer will be judged not only on compliance, but on their ability to harness data, technology and AI to support strategic decision-making
More than 200 tier promotions reshaped this year's European rankings as several international firms strengthened their positions in key tax markets
Ryosuke Takemura, OECD policy adviser, countered that the organisation’s role is ‘not to solve these issues one by one’ but to prevent tax disputes in general
Awards
ITR is delighted to reveal all the shortlisted nominees for the 2026 Asia-Pacific Tax Awards
Monica Erasmus-Koen and her Taxtimbre team will be responsible for building the firm’s TP capability in the competitive Netherlands market
Howden’s Rian Bahia explains how tax insurance can address known risks, unlock transactions and offer an alternative route through disputes and uncertainty
Haynes Boone’s new London partner, Alexandra Ueno-Park, argues that one-size-fits-all policies, billable-hour targets and outdated networking expectations can hold talent back
Death, taxes and Deloitte hoovering up trophies at an ITR awards night. Isn’t that the saying?
Gift this article