Jess Ladd is the founder and CEO of Callisto, a nonprofit that creates technology to combat sexual assault, support survivors, and advance justice, such as an online sexual as...

Dawn Laguens is an expert in residence at design and innovation firm IDEO and a strategic advisor at Redshift Leadership and The Vaid Group. In these roles, she is partnering...

Hunter Land is the associate director of cannabinoid research at Canopy Growth Corporation, the world’s largest cannabis producer. Previously, he was global project manager at...

Jessica Langer is a program officer for the Helmsley Charitable Trust’s Crohn’s Disease Program, helping to manage the program’s research grants portfolio and identify new opp...

Jonathan LaPook is a professor of medicine at NYU School of Medicine and the Mebane Professor of Gastroenterology at NYU Langone Health. A practicing physician, he is founder...

Matt Laslo is a freelance reporter based on Capitol Hill. Covering campaigns and federal policy since 2006, he has produced stories for NPR and its affiliates, VICE News, Roll...

Jeff Leach is the founder of the Human Food Project, an organization that seeks to raise awareness about changes in human ecology that have given rise to diseases of the moder...

Carrie Leana is the George H. Love Professor of Organizations and Management at University of Pittsburgh, with appointments in the business, medicine, and public affairs schoo...

Steven Levenson is a playwright and television writer who authored the Tony Award-winning book, Dear Evan Hansen. His plays include If I Forget, The Unavoidable Disappearance...

Allan Levey is the Goizueta Foundation Endowed Chair for Alzheimer’s Disease Research, Betty Gage Holland Chair, and chair of the Department of Neurology at Emory University,...

Ron-Li Liaw is director of the Sala Institute Center for Child and Family Resilience and service chief for child and adolescent psychiatry at Hassenfeld Children’s Hospital at...

Mallory Loflin is a research scientist and principal investigator in the Veterans Affairs San Diego Healthcare System and an assistant professor of psychiatry at University of...

Alexander Loznak is one of the 21 youth plaintiffs represented by legal nonprofit Our Children’s Trust in the US Supreme Court case Juliana v. United States, which challenges...

Charlie Lucas is a 13-year-old self-taught coder, proficient in Swift, Java, HTML, and Python. He co-created the NotOK app with his older sister, Hannah, who is 17. NotOK is a...

Hannah Lucas is a 17-year-old high school student who co-created the NotOK app. With a passion for mental health advocacy and business, she and her younger brother, Charlie, d...

Michele Lueck is president and CEO of the Colorado Health Institute, where her work ranges from consulting with leading academic organizations to serving rural health care pro...