Weissman is an expert on economic, health care, trade and globalization, intellectual property and regulatory policy, and issues related to financial accountability and corporate responsibility. He has written extensively on corporate accountability, access to medicines, corporate influence over the political process, the World Trade Organization and regulation of the financial markets. He has worked to lower pharmacy prices for AIDS victims and others in the developing world. His top priorities include climate change, health care reform, financial regulation and campaign finance reform.
Weissman has appeared on CBS, CNN, PBS, CNBC, NPR and Marketplace Radio, and has been published and quoted in publications such as The New York Times, The Wall Street Journal, The Washington Post, USA Today, the Economist, the Financial Times, the Associated Press, Los Angeles Times, The Philadelphia Inquirer and Time Magazine.