Professor Jacobsen is an annual member of the faculty for the National Institute for Trial Advocacy (NITA) program on “Building Trial Skills” for the Mid-Atlantic Region; was a featured Panelist at the 6th Annual Conference on Class Actions in Chicago in June 2010 presented by CLE International; the May 2001 Mealey’s “Emerging Drug Litigation Conference” in New Orleans and the Villanova Law School Sports and Entertainment Law Journal Fifth Annual Symposium on “Franchise Relocation;” 

Professor Jacobsen's article “A Tale of Two Circuits: Curbs on Legal Remedies for Exposure to Potentially Harmful Cell Phone Radiation Emissions,” was published in 2014 in Volume 10 of the Seton Hall Law School Circuit Review. His article "Rolling Back the 'Pink Tax': Dim Prospects for Eliminating Gender-based Price Discrimination in the Sale of Consumer Goods and Services" was published in the Spring 2018 edition of the California Western Law Review (Volume 54, No. 2). Professor Jacobsen's latest article "Leveling the Playing Field - U.S. Court Jurisdiction Over Disputes Between American Professional Athletes and Foreign Sports Teams' was published in the Spring 2020 edition of the Villanova Sports Law Journal. His article "Navigating [the] Amazon: Liability of E-Commerce Companies for Defective Products Sold on their Websites" was published in Fall 2021 edition of the DePaul Law Review.

Professor Jacobsen is admitted to practice before the Supreme Court of Pennsylvania, the United States Supreme Court, the United States Court of Appeals for the Second Circuit, the United States Court of Appeals for the Third Circuit, the United States Court of Appeals for the Fifth Circuit, the United States Court of Appeals for the Seventh Circuit, the United States Court of Appeals for the Ninth Circuit, the United States Court of Appeals for the Eleventh Circuit, the United States District Court for the Eastern District of Pennsylvania, the United States District Court for the Northern District of California and the United States District Court for the District of Arizona. Mr. Jacobsen is a cum laude graduate of the Villanova University School of Law, where he was the Managing Editor of the Villanova Law Review and was elected to the Order of the Coif. 

In the consumer area, Mr. Jacobsen has represented the interests of policy owners of insurance companies and was successful in enjoining the proposed conversion of Provident Mutual Life Insurance Company to a mutual holding company which resulted in the distribution of $1.3 billion in stock to policy holders. Mr. Jacobsen served as lead class counsel in O’Keefe v. Mercedes Benz USA, 214 F.R.D. 266 (E.D.Pa. 2003), a national consumer class action in which $33 million in extended warranties and other benefits were obtained for owners of Mercedes vehicles. In his most recent jury trial, Mr. Jacobsen won a unanimous $4 Million verdict on behalf of automobile dealerships against their lender in Mente v. GMAC (E.D. Pa.).

Professor Jacobsen was lead counsel in a class action against medical insurers in which settlement benefits of $75 million were obtained for 7,000 doctors in Central Pennsylvania in Grider v. Keystone Health Plan Central, Inc., Civil Action No. 01-5641 (E.D. Pa.)

More recently, Mr. Jacobsen was lead counsel in a class action brought by commercial delivery companies against the City of New York over illegally issued parking tickets, in which a $14 million settlement was achieved for his clients. Lockman v. City of New York, 11-cv-1836 (E.D.N.Y.)

In the environmental field, Mr. Jacobsen served as Plaintiffs’ Counsel in such cases as Cook v. Rockwell, et al., No. 90-K-181 (D. Colo.), a class action on behalf of Colorado citizens residing in the vicinity of the Rocky Flats nuclear weapons facility, whose property values were diminished as a result of releases of radioactive plutonium and other environmental contaminants from the plant, and which resulted in a $554 million jury verdict.

In the area of securities litigation, Mr. Jacobsen has played a leadership role in the prosecution of the Petro-Lewis Securities Litigation, Civil Action No. 84-C-326 (D. Colo.), in which a settlement valued in excess of $137 million was recovered on behalf of shareholders and limited partners; in the Baldwin United SPDA Litigation, MDL No. 581 (S.D.N.Y.), in which a settlement of more than $170 million in cash and other benefits was obtained on behalf of purchasers of annuities; and in several other substantial securities class actions and derivative litigation.

Professor Jacobsen also has been responsible for establishing appellate precedents in the business litigation and class action areas.