Sheldon Karon could be demanding at times and expected high quality work from attorneys at his firm. He balanced those qualities with warmth and kindness.“He was just so easy to talk with,” said Stanley C. Nardoni, counsel at Reed, Smith LLP. “You didn’t feel as if you were being evaluated. It’s such a positive feeling for a young lawyer.”Karon died last month in Glenview following a long illness. He was 85.Former colleagues remember him as a tough litigator who was passionate about the …