With courtroom successes for public companies, regional businesses, news outlets, and individuals, Sig is a trial lawyer with more than twenty-five years of hearings to his credit, including jury trials in state and federal court, multi-week complex arbitrations, and high-stakes administrative hearings. In a complex business case, Sig won a $13.6 million jury verdict in Maine state court. He has been counsel of record in many state and federal reported judicial decisions, including more than thirty state and federal appeals.

Sig's courtroom experience includes a range of complex state and federal litigation and appeals, including commercial litigation, owner/shareholder disputes, product liability claims, construction litigation, civil rights and constitutional litigation, professional liability disputes, government contracts appeals, and unfair trade practices.

In his media law practice, Sig represents the news media in First Amendment matters, defamation and privacy, state and federal freedom of information, newsgathering, and cyber law. He has also served as counsel in copyright, trademark, and advertising disputes.

Sig's environmental law practice includes toxic torts litigation, state and federal environmental enforcement defense, environmental damage and remediation claims, defense of natural resource damage claims, and land use litigation and appeals.

Active in securities disputes, Sig handles claims involving broker-dealers, securities fraud, and investment malpractice. He has participated as counsel in numerous Financial Industry Regulatory Authority (FINRA) arbitrations and in securities litigation in state and federal court. He is also a rostered American Arbitration Association (AAA) commercial arbitrator.