At Los Alamos, Professor Peng made pioneering contributions to several areas of medium energy physics. He was the first to recognize the feasibility of producing η mesons at the Los Alamos Meson Physics Facility (LAMPF) and made the first (π,η) measurements on nuclei. In the early 1980s, Professor Peng proposed the (π+,K+) measurements at Brookhaven National Laboratory's Alternating Gradient Synchrotron (AGS) accelerator, which ultimately identified single-particle states of lambda hypernuclei. Since the late 1980s, Professor Peng has made seminal contributions to high-energy nuclear physics in a series of experiments at Fermilab (E772, E789, E866, and E906), which pioneered the use of massive lepton pair production to probe the distributions of antiquarks in the nucleons and nuclei. Professor Peng initiated a program at the Jefferson Laboratory to measure the novel transverse momentum dependent parton distribution (TMDs). His group at UIUC also demonstrated the feasibility of the dressed-spin technique for an experiment to search for neutron electric dipole moment. He was a founding member of the Daya Bay Neutrinos Oscillation experiment which discovered the neutrino mixing angle θ13 in 2012. Professor Peng was the spokesperson or co-spokesperson for ~ 10 experiments carried out at various accelerator facilities. He also served as the president of Overseas Chinese Physics Association (OCPA) and as a member of the Program Advisory Committees at the Jefferson Laboratory, the Relativistic Heavy Ion Collider (RHIC) at the Brookhaven National Laboratory, the Japan Proton Accelerator Research Complex (J-PARC), and the Institute of Physics of Academia Sinica in Taiwan.