Over 180 collective years of infrastructure investment and asset management experience

ATI invests in projects and companies with downside resilience, adding value through sourcing, portfolio management, and operational improvements to enhance exit valuations.

ATI Publishes Third Annual Stakeholder Engagement Report

Bill is a Co-Founder and Senior Advisor of ATI. Bill was previously the 42nd Comptroller of New York City, serving eight years from January 2002 to December 2009. Bill’s experience in managing the finances of the nation’s largest city has afforded him insight into the infrastructure needs of local and state governments and gives him keen sensitivity to the expectations and requirements of large institutional investors. As Comptroller, Bill served as fiduciary to the five New York City Pension Fu

Henry is the Founder of American Triple I and serves as a Senior Advisor to the firm. Henry has been a pioneer in the investment industry for nearly 35 years, having successfully led and launched several investment platforms. In 2015, Henry became a part owner of the Siebert Williams Shank & Co., a financial services firm that has managed over $1.4 trillion of municipal bond offerings for the funding of general infrastructure projects, including social, education, health services, and transporta

Chief Investment Officer Investment Committee Member

ATI is a New York-based infrastructure investment manager targeting sectors with strong growth or modernization needs, aiming for consistent outperformance.

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ATI invests in infrastructure projects and companies, leveraging decades of experience in infrastructure, government, and finance to source, invest, and manage opportunities.

ATI invests in infrastructure projects and companies, leveraging decades of experience in infrastructure, government, and finance to source, invest, and manage opportunities.