**Preface to "Nanotechnology to Overcome World's Most Critical Health Issues: Liposomes and beyond—a Themed Issue Dedicated to Professor Yechezkel Barenholz"**

The Special Issue "Nanotechnology to Overcome World's Most Critical Health Issues: Liposomes and beyond—a Themed Issue Dedicated to Professor Yechezkel Barenholz" was written by experts in the field of nanomedicine to honor Professor Barenholz of the Hebrew University, Jerusalem, whose distinguished career influenced many young scientists and set up high scientific quality standards for all researchers worldwide. Throughout his career, Professor Barenholz taught at leading universities in Israel and the United States of America. He is known worldwide for his work on the development of a PEGylated liposomal doxorubicin formulation, known as Doxil®, which has completely transformed care for patients worldwide. This Special Issue includes both original research papers and review articles describing a variety of nanotechnology platforms, including (but not limited to) liposomes for drug delivery, which are geared toward overcoming the world's most critical health issues and supporting the sustainability of the environment. We are immensely grateful to Professor Jindrich Kopecek of the University of Utah, Professor Phillip Low of Purdue University, Professor Kwangmeyung Kim of the Korea Institute of Science and Technology, Professors Szilard Pal and Aleksandar Szechenyi of the University of P ´ ecs, Professor Kausik Chakrabarti of the University ´ of North Carolina at Charlotte, and Dr. Stephan Stern of the Nanotechnology Characterization Lab and their team members for contributing their knowledge and sharing their research in this Special Issue. We also want to acknowledge all members of the Immunology Section at the Nanotechnology Characterization Lab and Professor Afonin's Laboratory at the University of North Carolina at Charlotte, for their dedication and tireless work in helping to complete this Special Issue. We cordially thank Kylie Xiao and Marci Mao of the MDPI Editorial team for their help with finalizing the issue and preparing a book. We enjoyed working with everyone and wish them continued success in their future endeavors. On behalf of all authors and editors of this Special Issue, we wish Professor Barenholz a lifetime of wellness and happiness to cherish; thank you for everything you have taught us, and we will continue to learn from your wisdom.

> **Marina A. Dobrovolskaia and Kirill A. Afonin** *Editors*
