Established in 1947 to celebrate neuroanatomy and now promotes all of neuroscience.

Four Decades of Discovery in Forebrain Development

The Cajal Club is delighted to congratulate John L.R. Rubenstein, M.D., Ph.D. (Member of the Cajal Club) for having been chosen as the 2026 Gruber Neuroscience Prize Laureate. This award is one of the most important international prizes in Neuroscience. Rubenstein was chosen for his pioneering work on the development of the mammalian forebrain as well as for his pioneering work on the genetic control of the formation and organization of the neurons that are excitatory or inhibitory.

​

Rubenstein is the Nina Ireland Distinguished Professor in Child Psychiatry at the University of California, San Francisco. For over thirty years he has studied the genetic control of forebrain development. He established that in the developing forebrain, excitatory and inhibitory neurons are produced in separate locations. Pyramidal (excitatory) neurons of the neocortex are formed from the ventricular zone while Rubenstein showed inhibitory neurons that are produced in the basal ganglia migrate to the cerebral cortex and hippocampus. The work of his lab has also led to the identification of key transcription factors and their corresponding regulatory sequences that determine neuronal identity in the developing forebrain. The information gained here will be crucial in understanding aspects of epilepsy and autism.

​

More recently, this fundamental research has contributed to the development of a therapeutic strategy using transplanted cortical interneurons to treat focal epilepsy. The Gruber Foundation notes that initial clinical trials of this approach have produced encouraging results. Rubenstein has also emphasized the collaborative nature of his career, crediting the more than 100 trainees and numerous colleagues who have contributed to this body of research.

​

Rubenstein has long been associated with the Cajal Club. Former Club President (2010–2012) and current member of the Board of Directors, Rubenstein was the recipient of the Krieg Cortical Kudos Discoverer Award in 2004. More recently, with Cajal Club member Luis Puelles, he received the 2021 W. Maxwell Cowan Award for Developmental Neuroscience.

Rubenstein will receive the $500,000 Gruber Neuroscience Prize at the Society for Neuroscience Annual Meeting in Washington, D.C. on Sunday, November 15, 2026. Rubenstein will present the Gruber Prize Lecture, “A 40-year career studying the genetics of forebrain development: from a black box to gene regulatory networks and clinical therapy” from 3:00–4:30 p.m. in Hall D of the Walter E. Washington Convention Center.

​

The Cajal Club extends its warmest congratulations to John on this extraordinary recognition of a career that has transformed our understanding of cerebral cortex and forebrain development.

By Dawn Hunter, September 2026