He is also a Clinical Professor of Pediatrics at Albert Einstein College of Medicine as well as  president emeritus and co-founder (with singer-songwriter Paul Simon and Karen Redlener) of Children's Health Fund (CHF).

He also served as chairman of the national executive committee of Physicians for Social Responsibility, a public health organization promoting the prevention of nuclear war.

[7] Eleven Cuban-American doctors dismissed Redlener's opinion for not “having obtained a medical history, performed a physical examination or other proper psychological evaluations of Elian.

"[9] In 2003, Redlener was recruited to the Mailman School of Public Health at Columbia University to establish the National Center for Disaster Preparedness (NCDP).

Since 2003, Redlener has served as the founding director of NCDP, working to improve public policy and resources, as well as citizens’ individual preparedness.

[13] On November 15, 2012, following Hurricane Sandy, New York Governor Andrew Cuomo appointed Redlener co-chair of the NYS Ready Commission, which was tasked with finding ways to ensure critical systems and services are prepared for future natural disasters and other emergencies.

[14] On June 17, 2014, New York City Mayor Bill de Blasio named Redlener special advisor with a focus on emergency management and planning to support and advise the administration's citywide disaster preparedness and response efforts.

[15] Later, in 2017, Redlener worked with singer Marc Anthony to create Somos Una Voz to support the recovery of Puerto Rico following the devastation brought by Hurricane Maria.