This letter provides a recommendation for Gregory Coué from Professor Salvador Borrós. It describes Gregory's qualifications and strengths, including his ability to solve technical problems patiently through research and to work well in multidisciplinary teams. The letter highlights that Gregory has worked as a postdoctoral associate for over two years at Sagetis-Biotech and Professor Borrós' research group, where he helped develop new biodegradable polymer carriers for crossing the blood-brain barrier. Professor Borrós believes Gregory's skills and commitment would benefit any project he becomes involved in.