Allan graduated from Harvard Law School in 1979, and then clerked for the late Judge Robert S. Vance of the U.S. Fifth Circuit Court of Appeals. He founded the firm in 1981 and has since acquired a national reputation in the fields of complex litigation, environmental law, and consumer fraud. Many of his cases have become leading precedents or led to legislative and regulatory changes to better protect the public or the environment. He is frequently sought out as a teacher, lecturer, and author.
Allan has enjoyed a distinguished thirty-nine year career representing individuals, businesses and government entities in hundreds of complex, multi-district and high profile cases in both state and federal courts. Starting with In re: Three Mile Island Litig. (M.D. Pa.) and In re: Louisville Sewer Explosions Litig. (E.D. Ky.), he played a leading role in shaping the field of environmental and toxic tort litigation. Today his work and writings are reshaping the field of natural resource damages.
Allan currently represents the State of New Jersey for natural resource damage claims. He previously won the state's case against ExxonMobil that ended in the largest settlement in New Jersey history for natural resource damages. In addition, Allan represented the State of Louisiana in the Deepwater Horizon Horizon oil spill litigation, which resulted in the largest settlement on record for natural resource damage claims and economic losses, with Louisiana receiving over $8 billion. He serves as Lead Plaintiffs' counsel in a national MDL class action against Dollar General for the sale of obsolete motor oils, In re: Dollar General Corp. Motor Oil Marketing And Sales Practices Litigation, MDL No. 2709 (W.D.Mo.). He also currently represents New Mexico, Mississippi, and Vermont in environmental and consumer matters.
Allan is a member of the bars of California, the District of Columbia, Louisiana, New Jersey, Oklahoma, New York, Pennsylvania, Puerto Rico (Federal), and Texas.