George Jackson III said it’s no coincidence that three local bar leaders hail from Polsinelli P.C. “It’s the culture of the firm to be actively involved within the legal profession,” he said. Jackson and two other Polsinelli attorneys are proof of that assertion. Jackson, a shareholder at the firm, just completed a one-year term as president of the Federal Bar Association’s Chicago chapter. Associate Tiffany R. Harper is the current president of the Black Women Lawyers&rsquo …