In the law firmsMayer Brown LLP promoted nine lawyers to partnership:Marina G. Aronchik of the corporate and securities practice;Christopher M. Chubb of the banking and finance practice;Aaron Gavant of the restructuring, bankruptcy and insolvency practice;Jennifer A. Kratochvil of the banking and finance practice;Marjorie M. Margolies of tax controversy practice;Richard E. Nowak of the litigation and dispute resolution practice;Claire Gibson Ragen of the corporate and securities practice;Stephanie B. Vasconcellos of the …