The period crystallized an all-atom molecular dynamics paradigm, anchored by robust force fields and efficient algorithms. The SHAKE constraint method enabled larger time steps by fixing bond lengths, expanding simulations of flexible molecules and biomolecules. A widely used all-atom force field and MD engine for macromolecules established standardized workflows in protein modeling and dynamics, while a unified framework for canonical sampling provided reliable temperature control across systems. The projector augmented-wave approach unified pseudopotentials and LAPW to enable accurate first-principles MD, opening doors to Car-Parrinello–style simulations for materials and molecules. Updates to all-atom protein parameters further improved MD accuracy and adoption in structural biology. Historical Significance: These innovations created a durable cross-disciplinary platform for atomistic simulations in chemistry, biology, and materials science. By combining constrained dynamics, standardized ensembles, and first-principles integration, they enabled routine, quantitative insights into structure, dynamics, and thermodynamics of complex systems. The resulting MD framework underpins modern computational biophysics, chemistry, and materials design, guiding drug discovery, protein engineering, and multi-scale modeling for decades.