Audrey Choi
Managing Director, Head of Global Sustainable Finance Morgan Stanley

It's important to build broad and inclusive on-ramps for investors of all kinds.

Sterling K. Speirn
President and CEO W.K. Kellogg Foundation

Mission-driven investments can help philanthropists become more effective grantmakers.

Nancy E. Pfund
Founder, Managing Director DBL Investors

Impact investors can help shape the culture of young companies.

Nick O'Donohoe
CEO Big Society Capital

Impact investors go places, meet people, and find opportunities that other investors miss.

Amit Bouri
Cofounder and Managing Director Global Impact Investing Network

Proving that every impact investment goes beyond what mainstream investors bring is unrealistic.

Antony Bugg-Levine
CEO Nonprofit Finance Fund

To achieve social impact, investors and entrepreneurs must broaden beyond the enterprise.

Sasha Dichter
Chief Innovation Officer Acumen

To avoid creating a Potemkin village, impact investors must collect better social impact data.

John Goldstein
Cofounder and Managing Director Imprint Capital

Though it may ruffle some feathers, it’s time to begin parsing the big tent of impact investing.

Beth Richardson
Director of B Analytics and GIIRS B Lab

IRIS and GIIRS/B Analytics are an important first step in providing standardized social metrics.

Harold Rosen
CEO Grassroots Business Fund

Investors can create impact by providing advisory services to social businesses.

Brian Trelstad
Partner Bridges Ventures

Investors can have social impact by investing in underserved geographic areas.

David Wood
Director of the Initiative for Responsible Investment Hauser Institute for Civil Society at Harvard University

Contrary to what Brest and Born say, impact investors can have an impact on public equity markets.

Mike McCreless
Director of Strategy and Impact Root Capital
Catherine Gill
Vice President of Investor Relations Root Capital

Impact investors play a critical role even after mainstream capital enters the picture.

Alvaro Rodriguez Arregui
Managing Partner IGNIA
Michael Chu
Managing Director, Senior Lecturer IGNIA, Harvard Business School

Impact investors should not be burdened with proving social impact.

Matt Bannick
Managing Partner Omidyar Network
Paula Goldman
Director of Knowledge and Advocacy Omidyar Network

Impact investors can help spur the development of an entirely new sector.

Kelly Born
Fellow William and Flora Hewlett Foundation
Paul Brest
Emeritus Professor, Lecturer, and Faculty Co-Director Stanford Law School, Graduate School of Business, and Stanford Center on Philanthropy and Civil Society

Last Word: Paul Brest and Kelly Born respond to the 18 people who commented on their article.