George Mussalli was a panelist on the Bloomberg Invest conference panel "Solving the Data Dilemma in ESG Quant Investing."

Sustainable investment strategies have gained ground amid increased investor appetite and the potential for big returns. But even as sustainable investing has entered the mainstream, a lack of access to reliable ESG data has presented a unique challenge. Four of the top ESG quant investors talk about this phenomenon, and the solutions, with Bloomberg Sustainable Finance Editor Emily Chasan.