Dan is a trial lawyer and a business counselor. His antitrust and trade regulation practice includes counseling and litigation in mergers, acquisitions, price fixing, distributor relations, advertising, labor/antitrust, consumer banking, monopolization and franchising. He has represented plaintiffs and defendants in civil antitrust litigation; defendants in criminal antitrust trials; targets of federal grand jury investigations; and distributors and manufacturers in dealer-termination cases. He has represented both acquiring and acquired firms in friendly and hostile takeovers.

Outside the antitrust field, Dan has tried or been counsel in an array of corporate governance and commercial matters, and in class actions, arbitrations or lawsuits involving acquisition agreements, tender offers, supply contracts, false advertising, securities fraud, employment discrimination, public finance, consumer banking, health insurance, state insurance regulation and federal research grants.

Dan has been chair of numerous professional programs on antitrust issues and is the author of numerous professional articles on trade regulation law, litigation and law practice.