Hughes Socol Piers Resnick & Dym Ltd. added Matthew A. Arnold as a partner.Arnold joins the medical malpractice team with 20 years of experience representing hospitals, clinics, nursing homes and health care providers.Previously, he was a partner at Momkus LLC.• The Chicago-based International Association of Defense Counsel has entered into a two-year cross-promotional partnership with the International Institute for Conflict Prevention and Resolution, or CPR, a global nonprofit organization that advances dispute …