Paul Root Wolpe examines the ethical implications of new science -- genetic modification, neuroscience and other breakthroughs that stretch our current philosophy to the breaking point. He's the chief bioethicist at NASA, among other appointments.

Stephen Coleman studies applied ethics, particularly the ethics of military and police force, and their application to human rights.

Kelly Richmond Pope researches organizational misconduct, ethics and fraud.

Danielle Allen is an expert on the intersection of ethics and democracy.

Based in Bulgaria, Steve Keil creates companies around big social and environmental goals.

Jonathan Marks works at the intersections of ethics, law and policy -- writing and speaking about torture, obesity, fracking, health care and other pressing issues of our time.

Over the past 35 years Peter Saul has been intimately involved in the dying process for over 4,000 patients. He is passionate about improving the ways we die.

Think of Surya Mattu as a data detective. As he writes: "I am interested in figuring out the ways in which algorithmic systems harm people."

Sometimes controversial, always practical ethicist Peter Singer stirs public debate about morality, from animal welfare to global poverty.

Liene Ozoliņa teaches sociology and researches post-socialist politics and culture.

Kwame Anthony Appiah is a philosopher, cultural theorist and novelist. His latest book is "The Honor Code," exploring moral revolutions.

Rodrigo Canales wants to understand how individuals influence organizations or systems--even those as complex as the Mexican drug cartels.

Britt Wray's work is about life and what we make of it: past, present and future.

Michael Patrick Lynch examines truth, democracy, public discourse and the ethics of technology in the age of big data.

Erika Bachiochi is a legal scholar specializing in equal protection jurisprudence, feminist legal theory, Catholic social teaching and sexual ethics.

Anthropologist and media scholar Mary L. Gray focuses on how the everyday use of technology (including artificial intelligence) transforms our lives -- for better and worse.

Alice Dreger studies history and anatomy, and acts as a patient advocate.

Philosopher Thomas Pogge wants to ensure medications get to those who need it most. He has published on a wide range of subjects such as global justice and human rights.

Erika Cheung was one of the key whistleblowers in the Theranos scandal.

Aarathi Krishnan designs institutions and systems that help us imagine equitable futures for all.

Jennifer Doudna was part of inventing a potentially world-changing genetic technology: the gene editing technology CRISPR-Cas9.

Kate Darling investigates the relationship between humans and robots -- now, and in the future.

Dr. Nir Eyal is an international authority in population-level bioethics with research in health inequalities, health promotion and research ethics, especially in resource-poor settings.

At Splunk, James Hodge builds elegant navigation tools to help make big data accessible and useful.

Britain's former prime minister Gordon Brown played a key role in shaping the G20 nations' response to the world's financial crisis, and was a powerful advocate for a coordinated global response to problems such as climate change, poverty and social justice.

Juan Enriquez thinks and writes about the profound changes that genomics and brain research will bring about in business, technology, politics and society.

Ronald Sullivan is a leading theorist in the areas of criminal law, criminal procedure, trial practice and techniques, legal ethics and race theory.

Jessica Kerr has been fascinated by the role of judges in society for over a decade, and increasingly concerned by the shroud of mystery that surrounds them.

Zelalem Adefris's work in public health addresses racial health and wealth disparities, policy development and climate resilience in low-wealth communities of color.

Travis Rieder wants to help find a solution to America’s opioid crisis -- and if that sounds a bit too lofty, he’d settle for making clear, incremental progress in a responsible, evidence-based way.