Dr. Laura Condon is an extraordinary researcher and a field builder, selected for the 2025 James B. Macelwane Medal for her pioneering contributions to simulating groundwater-surface water interactions under human influence. She is a hydrologist of exceptional depth and breadth who has made foundational contributions to our understanding of groundwater-surface water interactions, the imprint of human activity on the hydrologic cycle, and the integration of statistical and machine learning tools in hydrologic research. Condon's most notable achievement is her leadership in large-scale integrated hydrologic modeling by coupling variably saturated subsurface flow with surface routing across the continental United States. This landmark work revealed significant spatial variability in water table depth and demonstrated that groundwater plays an active, dynamic role in surface energy balance and evapotranspiration. Her research showed that ignoring groundwater can lead to biased projections of future water availability, catalyzing a shift in how the hydrology community views groundwater. Building on this foundation, Condon has recently focused on human-driven hydrologic change, including the influence of water infrastructure and management. Her team has developed the most comprehensive dataset of historical reservoir operations in the United States, has enabled continental-scale studies on water storage and drought resilience, and leads a national initiative that applies machine learning to water management. Beyond her research, Condon is a talented science communicator and educator who is deeply committed to open science and training. She has developed accessible hydrologic tools, like a virtual sand tank application used by over 50,000 students, and an interactive data platform that visualizes U.S. hydrologic conditions. Her Water Whys program at the University of Arizona brings students together to create graphical explanations of hydrologic concepts for broadcast meteorologists. Condon's ideas have been accelerating implementation to bring stakeholders to the forefront of hydrologic challenges. Her contributions to the National Climate Assessment and the President's Council of Advisors on Science and Technology groundwater initiative demonstrate her ability to translate science for decision-makers and shape the national agenda on water resilience. Condon's work is redefining what it means to do hydrology at scale, from intellectual depth to societal relevance and community impact. —Kamini Singha, Colorado School of Mines, Golden, Colorado