the charged particle heating via resonant absorption within Alfvén wave continuous spectrum. They discovered the Kinetic Alfvén wave, which resolves the logarithmic singularity of magnetohydrodynamic shear Alfvén waves and plays important roles in the heating, acceleration and transport of charged particles in solar, magnetospheric, and laboratory plasmas. From 1974, Chen worked for 19 years at Princeton Plasma Physics Laboratory (PPPL) and Princeton University, there his interest was directed to the study of fusion plasmas. He, in collaboration with Edward A. Frieman, formulated and derived the first nonlinear gyrokinetic equation, the Frieman-Chen equation named in their honor, which has played a fundamental role in the physics understanding of strongly magnetized plasmas in the last decades. With Chio-Zong Cheng and Morrell S. Chance, Chen predicted the existence of hydromagnetic Alfvén bound states in laboratory plasmas due to realistic symmetry-breaking equilibrium conditions. These hydromagnetic Alfvén bound states were later observed in worldwide plasma experimental devices. Chen is also well known for his collaboration with Roscoe White and Marshall Rosenbluth in demonstrating theoretically that supra-thermal energetic particles can spontaneously excite in laboratory plasmas a unique macroscopic hydromagnetic wave, observed experimentally as “fishbones” from the magnetic signals. From 1986 until 1993, Chen served as the deputy head of the Theory Department at PPPL. In 1993, Chen became a professor of Department of Physics & Astronomy at the University of California, Irvine (UCI). During this period, Chen discovered the existence of energetic-particle modes within the shear Alfvén wave continuous spectrum and introduced a unified theoretical framework to understand the distinctive features of different Alfvén bound states and energetic-particle continuum modes. Subsequently, in the past two decades, this theory was generalized by a series of papers written jointly with Fulvio Zonca, and named as the general fishbone-like dispersion relation. In 2000, Chen and coworkers elucidated that drift wave turbulence can spontaneously generate coherent zonal flows via intensity-modulation interactions, resulting in turbulence self-regulation. This nonlinear process has a broad scope of applications and has been generalized to the zonal structures in charged particle phase space. Chen retired from UCI in 2012. Chen visited mainland China in 1975 for the first time after the normalization of US-China relationship. Chen has, throughout the years, played active roles in the development of plasma physics research as well as training next generation of plasma physicists both in mainland China and Taiwan. In 1985, Chen helped Shih-Tung Tsai and Changxuan Yu to establish