Dr. Dipen Kumar Rajak is a Scientist-C in the Light Weight Materials Division at CSIR–Advanced Materials and Processes Research Institute (CSIR-AMPRI), under the Ministry of Science & Technology, Government of India, Bhopal, Madhya Pradesh. Dr. Rajak has made significant contributions to the fields of Mechanical and Materials Engineering. He earned his Ph.D. from the Indian Institute of Technology (Indian School of Mines), Dhanbad, where his research focused on the crashworthiness analysis of empty and foam-filled structures. He has over 13 years of teaching and research experience in Mechanical and Materials Engineering and is a life member of several professional societies. In recognition of his outstanding research contributions, Dr. Rajak has received several prestigious awards and has been recognized as one of the World's Top 2% Scientists (Stanford University–Elsevier ranking) for five consecutive years since 2022. His research output includes more than 150 peer-reviewed journal publications, 7,322 citations, 3 authored books, 6 edited books, 16 book chapters, 18 patents (filed/granted in India, the United States, South Africa, and Australia), 2 industrial designs, and 1 copyright. His primary research interests include the development and processing of metallic foams, high-entropy alloys, and advanced polymer & composites for lightweight structural applications.