Two members of Dewey & LeBoeuf's four-strong leadership team are set to leave as Winston & Strawn and O'Melveny & Myers become the latest firms to benefit from the fallout at the embattled firm.

The departure of Richard Shutran and Jeffrey Kessler to O'Melveny and Winston respectively leaves Charles Landgraf and Martin Bienenstock as the only two remaining members of Dewey's office of the chairman, reports the Am Law Daily.

Shutran, the co-chair of Dewey's corporate department and the chair of its global finance practice, is joining O'Melveny along with tax chair Arthur Hazlitt, renewable and clean energy practice co-chair Junaid Chida, and partners Dev Sen and Mark Caterini, all of whom are based in New York.

Shutran was considered the primary liaison at Dewey with the firm's banks. He helped Dewey orchestrate a nearly $150m (£93m) bond offering in 2010 designed to refinance the firm's existing bank debt. Payments on that bond were due to begin next year.

Meanwhile, a Kessler-led team of roughly 60 lawyers – 23 of them partners – prepared to leave Dewey for Winston. In addition to belonging to Dewey's office of the chairman, Kessler was also global litigation chair and the co-chair of the firm's prominent sports litigation group.

Winston chairman Dan Webb said that his firm had been in "intense negotiations" over the past week to bring a "significant number of litigators" from Dewey's offices in Chicago, London, Los Angeles, New York, and Washington, DC. Webb said that the bulk of the hires will be in New York, where Winston has wanted to bolster its presence in recent years.

"We've really wanted to build up our national litigation profile, and you can't do that without expanding on the East Coast," he commented.

Kessler's group, in addition to negotiating with Winston, had also held talks with Greenberg Traurig, King & Spalding, and Morrison & Foerster. US website Above the Law first reported on Wednesday morning that Kessler and his group were headed to Winston, which is also poised to pick up Dewey energy and project finance partner Elias Farrah in Washington DC along with an associate and paralegal from the ailing firm.

Winston will also take on dozens of other associates and an undetermined number of administrative staff from Dewey, with most of the new hires to join Winston as soon as Monday.

Other key partners joining Winston include sports litigation practice co-chair David Feher and long-time Dewey litigators Harvey Kurzweil and Seth Farber, the latter two of which were conducting an internal inquiry into the business practices of former Dewey chairman Steven Davis, who is also under investigation by the district attorney's office in Manhattan.

Dewey's remaining partners have yet to schedule a vote on a dissolution of the firm, although Dewey is expected to shut its doors by 5 May, a date on which the firm's California offices are scheduled to close. Some US associates at the firm have been told layoffs could also begin sometime in the next few days.