Attorney
catherine@thehalpernlawfirm.com
Our Attorney, Catherine O’Sullivan, is licensed in Pennsylvania and Colorado with a strong foundation in legal research, writing, and appellate analysis. She clerked for the Colorado Supreme Court, where she supported judicial decision-making, assisted with drafting opinions, and managed complex casework. Catherine earned her Juris Doctor in 2024, serving as an editor for a law review and publishing scholarship on constitutional interpretation. She brings a thoughtful, detail-oriented approach to every case and is passionate about advocacy, ethics, and community service. Outside of her legal work, she enjoys hiking, horseback riding, and adventure travel.
Office Locations
philadelphia main office
610 Old Lancaster Rd, Suite 100
Bryn Mawr, PA 19010
cherry hill office
923 Haddonfield Rd, Suite 300 Cherry Hill, NJ 08002
pittsburgh office
2429 East Carson St. Suite 201 Pittsburgh, PA 15219
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