Walsh is the president of the Walsh Company, a general contracting and project management firm he founded in 2003. Before establishing his own firm, Walsh worked as a senior vice president at Gale & Wentworth, a diversified real estate investment and services company.
Public service and philanthropy From 2010 to 2018, Walsh was chairman of the
New Jersey Schools Development Authority under Governor Chris Christie, where he was responsible for managing school construction and renovation projects. In addition to his public service, Walsh has been an active supporter of the
Republican Party. He was a delegate to the
2020 Republican National Convention and backed
Donald Trump's re-election campaign. Walsh has contributed to various nonprofit organizations in Morris and Somerset counties, New Jersey. He has been recognized for his work with the
American Cancer Society, Somerset Hills Learning Institute, Interfaith Food Pantry of Morristown, Employment Horizons, Jewish Vocational Services, and Family Service of Morris County. == United States ambassador to Ireland (2025–present) ==