Barnes & Thornburg LLP added Robert M. Weiss as a partner in the corporate department.Weiss advises clients on complex technology and data transactions, web and e-commerce matters and strategic alliances.Previously, he was a partner at Neal, Gerber & Eisenberg LLP.• Polsinelli P.C. added Edward J. Hannon as a shareholder in its tax practice.He will provide counsel to clients on the development of tax savings structures for the acquisition and disposition of privately held businesses and advise clients on the …