In Your Corner


Peter O’Mara

Peter O’Mara is a partner at O’Mara Gleason O’Callaghan and focuses his practice on business counseling and litigation in the financial services industry. A former Assistant State’s Attorney for Cook County, Peter worked for more than a decade on contract matters for many clients at the Board of Trade, drafting […]

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Peter O’Mara

Richard Gleason

Richard Gleason is a partner at O’Mara Gleason O’Callaghan. He focuses his practice in litigation arising out of product liability, negligence, employment matters, and fraud. Rich began his career in the courtroom as a prosecutor in one of the busiest criminal court systems in America. Starting as a Cook County […]

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Richard Gleason

Sean O’Callaghan

Sean O’Callaghan is a partner at O’Mara Gleason O’Callaghan, where his practice focuses on general business counseling and litigation. Sean has guided multimillion dollar companies through mergers and acquisitions as well as advised small startups regarding formation and partnership matters. When necessary, Sean has successfully represented his clients in state […]

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Sean O’Callaghan

Trevor Orsinger

Trevor Orsinger is of counsel at O’Mara Gleason O’Callaghan and focuses his practice on financial services, government relations, and litigation. Prior to joining O’Mara Gleason O’Callaghan, Trevor worked for the CME Group, Inc.—the world’s leading and most diverse derivatives marketplace—in their Market Regulation Department. In that role, he examined the […]

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Trevor Orsinger

Alexandra Pizarro

Alexandra Pizarro is a paralegal with O’Mara Gleason O’Callaghan. She manages client files and assists in preparing for litigation or resolution, as well as drafts legal pleadings and correspondences. She is knowledgeable in Illinois civil procedure and frequently works on employment and personal injury matters. She has worked in law […]

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