Michael J. "Mike" O'Callaghan

In October 2015, Grier joined the ATWF team, bringing with him many years of experience in all areas of medical litigation, including cardiovascular, neurologic, neursurgical, radiology, oncology, obstetric-gynecologic and hospital administration issues. Grier’s litigation immersion began with his employment as a staff attorney at the Franklin County Court of Common Pleas in Columbus. His next position with Earl Warburton & Adams lasted over 25 years. Starting as an associate and wo...

Frederick A. Sewards is a top attorney recognized by Best Lawyers in the practice area(s) of Medical Malpractice Law - Defendants. Frederick A., who practices law in Columbus, Ohio, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Frederick A. is held by other top lawyers in the same geographic and legal practice area.

Dennis E. Horvath is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law. Dennis E., who practices law in Columbus, Ohio, has been recognized since 2018. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Dennis E. is held by other top lawyers in the same geographic and legal practice area.

Kathryn S. Wallrabenstein is a top attorney recognized by Best Lawyers in the practice area(s) of Criminal Defense: General Practice and Criminal Defense: White-Collar. Kathryn S., who practices law in Columbus, Ohio, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Kathryn S. is held by other top lawyers in the same geographic and legal practice area.

Dennis Concilla practices securities law, business law and litigation at Carlile Patchen & Murphy LLP, where he provides counsel to securities broker-dealers, investment advisors, registered representatives and banking institutions. CPM’s Securities Practice Group, headed by Dennis Concilla, is nationally recognized as a leader in the field of securities recruiting law and has represented numerous national and regional securities and investment firms. Dennis served as Legal Counsel ...

Jeffrey E. Kaman serves as the Administration Department and Columbus Office Chair at Kaman & Cusimano LLC, located in Columbus, Ohio. Jeff obtained his law degree from the Cleveland Marshall College of Law after graduating with honors from Loyola University Chicago with degrees in Honors History and Political Science. At Kaman & Cusimano, Jeff is extensively involved in community association law, concentrating on association operations, managing general operational inquiries, and ded...

David A. Riepenhoff is a top attorney recognized by Best Lawyers in the practice area(s) of Employment Law - Management, Labor Law - Management and Litigation - Labor and Employment. David A., who practices law in New Albany, Ohio, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which David A. is held by other top lawyers in the same geographic and legal practice area.

Eric Estadt joined Carlile Patchen & Murphy LLP in 2022 and is a member of the firm’s Business Law Practice Group. He has experience supporting a wide range of clients, from Fortune 500 companies to individuals, protecting and enforcing their trademarks in a wide array of industries. Eric specializes in utility and design patents in the mechanical, medical device, pharmaceutical, and electronics industries.

Pursuant to a merger with the firm in which he was a principal since 1985, Alan has been a Partner at Carlile Patchen & Murphy LLP since 2015. He primarily works with closely held and family businesses of all types and the individuals and families who own those businesses. Alan’s practice areas cover a broad range of business and personal matters, including – tax-exempt nonprofits; real estate; estate planning and estate & trust administration; planning, structuring, and f...

Dave Swift is an of-counsel at Carlile Patchen & Murphy LLP and a Family Wealth & Estate Planning Group member. He practices estate planning, estate and trust administration and also engages in the representation of tax-exempt organizations. Dave represents individuals, business owners and families concerning estate planning, tax planning and business succession planning.