Skip Navigation Skip to Footer
Philadelphia skyline
Conrad O'Brien logo

Conrad O'Brien

A uniquely agile approach to litigation

We are pleased to announce that Conrad O’Brien has combined with the international law firm Clark Hill effective February 1, 2023.


"Law firms, like many businesses, go through evolutions. We’re confident that for our clients and our colleagues, combining with Clark Hill is the next best step for us. Being able to offer our clients access to a wider array of legal services and provide our lawyers with increased professional opportunities was very attractive to us. But what set Clark Hill apart is its culture. They’re collegial, collaborative and committed to diversity, equity and inclusion, all of which makes it an attractive place to work and to expand upon the culture of Conrad O’Brien."


- Nicholas Centrella, previously Managing Partner at Conrad O’Brien, and now a Member at Clark Hill. Learn more here.

law firm interior lobby


Why Choose Conrad O’Brien? 

Our uniquely agile, collaborative approach to litigation allows us to solve clients' problems. Whether it’s successfully taking a case to trial or preventing legal problems before they occur, we perform with the smarts and tenacity of a special-ops team.



"Real integrity as they pursue cases. And they have real empathy for the clients that they're working with."

General Counsel

"The Conrad O'Brien team is responsive, on top of all deadlines and always willing to discuss and explore alternative theories. They have a very deep bench in Pennsylvania for litigation."

Source in Chambers USA 2022

"They are the caliber of a big firm with the strengths and decency and family approach."

General Counsel

"They work collaboratively to make sure the matter is sorted in the client's best interest and make sure there are no missteps."

Source in Chambers USA 2022

"They are smart, hard-working, and incredibly capable."

Client, Colleague, & Referral Source

"They work hard to learn the facts and set up a clear pathway forward to resolve the situation. They strategically plot each step using their knowledge of the subject matter and experience to give good advice on how to proceed."

Source in Chambers 2022

"They don't only act as the outside counsel, they partner with in-house counsel and they become part of your team."

General Counsel

"They're exceptionally skilled, terrifically capable in litigation and legal advice. They bring an extraordinarily extensive expertise."

Source in Chambers USA 2021

"Strategic and tenacious."

Source in Chambers USA 2021

"The team works really well together. They have a good sense of strategy in approaching litigation and they have gone the extra mile in finding the correct arguments to support our case."

Client in Chambers USA 2020

"Conrad O’Brien is 'the premier litigation boutique firm in Philadelphia.'"

Source in Chambers USA 2020

Our Expertise


While we have a formidable reputation in the courts of Pennsylvania, we also regularly take on national cases.


We deftly handle complex cases in these key practice areas:

Our Approach

How We Work


We are tenacious and driven in everything we do. We run litigation teams that embrace flexibility, collaboration, and creative problem-solving at every step. Our uniquely nimble approach yields a more efficient operation and an impressive record.

How We Think


We know the law—we’re made up of former clerks, federal prosecutors, and federal judges; experienced trial attorneys; big-firm laterals; and top law-school grads. We thrive on challenges that require creative, big-picture thinking.

How We Treat People


We value empathy and integrity just as much as getting the job done. We don’t worry too much about hierarchy, which means we’ll focus on your case, not our egos. We provide responsive service.