Schiff Hardin LLP has enlisted two partners as the next leaders for the firm’s own diversity group.Sailesh K. Patel in the firm’s Chicago office and Christine A. McGuinness in New York took charge of the committee last week, replacing Regina Speed-Bost, a former partner who joined the Washington, D.C., office of Reed Smith LLP earlier this month.Marci A. Eisenstein, Schiff’s managing partner, was the founding chair of the committee when it launched.Schiff employs more than 300 attorneys in six offices …