Allan Shih-Ping Chang, a Princeton graduate alumnus and principal scientist at the Lawrence Livermore National Laboratory, is leveraging his expertise in materials science to pave the way for the widespread adoption of hydrogen as a clean energy source. Stationary hydrogen tanks and fuel cells are increasingly being used for energy generation in homes and businesses, but the risk of hydrogen leaks poses a safety challenge due to its flammability. Chang and his team are developing a fiber-optic sensor that can quickly and accurately detect even tiny hydrogen leaks, aiming to remove a significant barrier to the expanded use of hydrogen energy. Chang's passion for materials science and photonics, cultivated during his academic journey, has been instrumental in shaping his research approach. His interdisciplinary background allows him to work on various projects at Lawrence Livermore, ranging from hydrogen safety solutions to nuclear nonproliferation monitoring and climate change mitigation. Collaborating with internal teams and external partners, Chang is leading the development of the fiber-optic gas sensor technology, which he considers his most significant ongoing project. Through his work, Chang seeks to contribute to the fight against climate change and promote the transition to cleaner energy sources. His journey from exploring nanoimprint lithography at Princeton to pioneering hydrogen safety solutions underscores the transformative impact of interdisciplinary research and the application of materials science in addressing global challenges.