Aside from a clerkship under Judge Irving R. Kaufman in the United States Court of Appeals for the Second Circuit, Karp has worked continuously at Paul, Weiss since he began as a summer associate.
His clients include JPMorgan Chase, Wachovia, Morgan Stanley, Apollo Global Management, Merrill Lynch, Deloitte, MacAndrews & Forbes, ING, Bear Stearns, Ericsson, Hexion, Scottish Power and Eton Park in securities, commercial and regulatory matters.
[4] The strength of his work for Citigroup in the wake of the Enron and WorldCom scandals featured prominently in Paul, Weiss being named "Litigation Department of the Year" by The American Lawyer in 2006.
[8] Karp serves as a director of the Legal Action Center, a non-profit law and policy organization in the U.S. whose sole mission is to fight discrimination against people with histories of addiction, HIV/AIDS, or criminal records.
[9] Karp has won numerous awards for his legal accomplishments, including receiving the New York Law Journal's first Impact Award in 2013, for “innovations to the partnership model … outstanding representation of clients during the financial crisis … and commitment to public service that has boosted the firms' pro bono hours.”[10] In 2012, he was named by The Financial Times as one of 10 lawyers who are “agents for change.”[11] Best Lawyer selected him as "Banking and Finance Litigator of the Year" for 2017 and 2014.