William J. “Billy” O’Brien’s skill as a trial lawyer was inimitable.

“He could take his client’s cause and make a jury relate to it quickly and better than any trial lawyer I have seen,” said Patrick J. O’Connor, vice chairman of Cozen O’Connor and a former colleague of O’Brien’s at Pepper Hamilton. “He could get a jury to identify with his client … and he started that with voir dire. He was a master at voir dire, in selecting a jury that, in his judgment, would listen to the facts and come to the conclusion that he thought they should come to based on his client’s story.”