Nixon Peabody LLP added Michael J. Summerhill as a partner in its complex commercial disputes practice.Summerhill focuses his practice in litigation, appellate litigation and complex commercial disputes. He has experience representing clients in class actions, multidistrict proceedings, mass torts and commercial disputes, product-liability and securities and consumer fraud actions.He joins from Freeborn & Peters LLP.• Fox Rothschild LLP partner Allen J. Guon was named chair of The Chicago Bar Association’s …