Mr. Cullen has represented clients in complex pharmaceutical, product liability and toxic tort litigation for over 30 years. He has taken cases to trial in over 15 states while representing clients as both national and trial counsel.  

Mr. Cullen has represented several clients in the pharmaceutical industry, including Bayer, Pfizer and Eisai. He has represented Bayer as national and trial counsel for more than 25 years in various litigations including - HIV litigation from blood products, PPA litigation, Hepatitis C litigation, Baycol litigation, YAZ litigation, and litigation stemming from Bayer's anti-infective medications, CIPRO and Avelox. Mr. Cullen has represented Eisai as national trial counsel in product liability, qui tam and anti-trust litigation. He has worked closely with many companies including Bayer and Eisai in risk assessment and litigation management, as well as the defense of thousands of individual product liability actions.

Mr. Cullen also serves as national counsel for Crown Equipment Corporation in catastrophic injury product liability litigation. As national trial counsel for Crown, Mr. Cullen has tried over 25 catastrophic injury actions in numerous states across the country. These cases have involved allegations of defective designs, inadequate warnings, or failure to meet appropriate standards of care. 

Further, Mr. Cullen has also been involved in the defense of toxic tort litigations including commercial talc, carbon monoxide, lead paint exposure, as well as exposure to many other chemicals and pesticides. Mr. Cullen has participated in the defense of thousands of toxic tort and product liability actions and tried numerous toxic exposure cases in the Mid-Atlantic Region to verdict.