Investment Management

Nationalization: The Tidal Power Surge

August 26, 2022


John Allen
John Allen

Chief Investment Officer, Partner

John joined Aspiriant in 2014 as Chief Investment Officer. As CIO, John is primarily responsible for leading the firm’s overall Investment Strategy & Research Group, broadly consisting of 12 professionals. The group is responsible for asset allocation, portfolio construction, manager selection and risk management. John also chairs the firm’s Investment Committee and serves on a number of other committees. He has over 20 years of experience in investment management, investment banking, corporate finance advisory and business strategy consulting.

Prior to joining the firm, John was a senior member of the client service team at Grantham, Mayo, Van Otterloo (GMO), which manages approximately $80 billion across a wide-range of public equities, fixed income, hedge funds and asset allocation funds. In that role, John had primary responsibility for 80 clients and $6.5 billion in assets under management.

Prior to joining GMO, John was the Head of Investments at a large family office in Los Angeles. There, John had responsibility for managing the firm’s overall investment portfolio as well as its direct investments. Previously, John established his career working in the investment banking department at Donaldson, Lufkin & Jenrette and in the business consulting practice at Stern Stewart & Co. Throughout his career, John has served on the boards of directors of three private companies.

John earned a Bachelor of Science degree with high distinction from the Economics Department at the University of Virginia. He holds the Chartered Financial Analyst® (CFA®) designation and the Chartered Alternative Investment Analyst (CAIA) designation. He is also a member of the CFA Institute and CAIA Association.

John lives in Los Angeles with his family.

Marc Castellani
Marc Castellani

Managing Director in Investment Strategy & Research, Member of Board of Directors, Partner

Marc joined Aspiriant in February of 2015. He has over 25 years of experience in the financial services industry. Marc oversees the firm’s private investment offering (private equity, venture capital, hedge funds and private real estate), and actively works with his colleagues on asset allocation, investment strategy and manager selection. Marc is a member of Aspiriant’s Investment and Client Service Committees.

Prior to joining the firm, Marc worked at the J.P. Morgan Private Bank in Los Angeles in a senior client management role and worked with families and high net worth individuals on portfolio management, tax planning, liability management and wealth transfer strategies. Before moving to Los Angeles in 2009, Marc worked for several years in New York City in the Mergers and Acquisitions departments of J.P. Morgan and Banc of America Securities. In that capacity, Marc advised large multinational clients and privately held, family-owned businesses on a range of strategic alternatives including sales, mergers, acquisitions, divestitures, spin-offs and growth equity financings.

Marc earned his undergraduate degree at Cornell University and his graduate degree in finance at the University of Rochester.

Marc lives in Manhattan Beach with his wife and children.


Get Aspirant Fathom Articles Direct to your Inbox

Want the latest wealth management tips, investment insights and Aspiriant news delivered straight to your inbox. Sign up for regular Fathom updates so we can send you the most relevant content you selected below.


Next up

Blog detail footer callout img

Meet the Team

In the end, a firm boils down to the people.

Learn more
Blog detail footer callout img