Greenberg Traurig Maher (GTM) has seen two of the three partners in its Birmingham office leave the firm, with energy & infrastructure partners Francis Patalong and Paul Kirkby both departing earlier this month.

The pair, whose new destinations are unclear, joined GTM in 2010 from DLA Piper to launch the Birmingham office alongside fellow energy & infrastructure partner Andrew Herring and DLA's then UK energy chief Neil Upton.

Upton stepped down from the partnership earlier this year to take a commercial interest in a project owned by one of the firm's clients but remains a consultant with GTM.

The departures mean Herring is the only remaining partner in Birmingham, working alongside three associates, one of whom is on secondment to AstraZeneca.

Legal Week reported earlier this summer that GTM is to invest primarily in transactional corporate work in the energy sector from now on, pulling away from further expansion in other areas.

Separately, GTM has strengthened its corporate practice with the hire of partner Henrietta Walker from Mayer Brown. Walker, who is set to join the firm towards the end of the year, will work alongside London managing shareholder Paul Maher (pictured).

GTM declined to comment.