Holly provides coordination and guidance for the collaborative development of a regional network of groundwater management projects to enhance water availability for the San Pedro Riparian National Conservation Area, managed by the U.S. Bureau of Land Management. Eight projects developed by the Cochise Conservation and Recharge Network (https://ccrnsanpedro.org) currently enhance groundwater storage while promoting climate change resilience along 25 miles of the river and its tributaries. Her responsibilities include the integration of hydrologic models, regional research, and monitoring programs to inform decision-making. Additionally, she focuses on coordination of strategic planning, engineering studies and infrastructure project design in collaboration with local, state, and federal agencies, private foundations, and other stakeholders to ensure sustainable water management.

Holly coordinates the interagency science-based adaptive management process for the San Pedro Riparian National Conservation Area, which was initiated in 2021 under a Memorandum of Understanding between the US Bureau of Land Management, Fort Huachuca/US Army, Cochise County, and the City of Sierra Vista. This process is recognized as a collaborative approach that promotes climate change resilience while allowing for flexibility in decision-making based on shared science. It aims to enhance sustainable water management across the boundaries of the SPRNCA and its neighboring cities, towns, and military installations, contributing to effective ecological restoration efforts.

Holly serves as an Advisor to the Arizona Tri-University Recharge and Water Reliability (ATUR) Project,  a collaborative research effort involving the University of Arizona, Arizona State University, and Northern Arizona University to enhance groundwater supplies. It identifies locations and methods to capture water—such as runoff and precipitation—that would otherwise evaporate, focusing on suitable recharge sites statewide. The project is funded by the Arizona Board of Regents and involves collaboration with the Arizona Department of Water Resources.  

During 2023-2024 Holly supported the work of the Fort Huachuca Sentinel Landscape Partnership, led by the US Department of Defense, Department of the Interior, and the Department of Agriculture, to enhance climate change resilience, conserve natural resources, and strengthen military readiness across a 3-million acre landscape in southeastern Arizona. These science-based conservation planning efforts involved a diverse group of public and private partners, to prioritize and implement strategies for ecological restoration and sustainable water management for regional 'Sky Island' grassland, forest, and riparian ecosystems.

Holly was selected for a Coda Fellowship with The Nature Conservancy from 2021-2022, where she focused on developing guidance for sustainable water management to conserve freshwater systems globally. During her fellowship, Holly collaborated with conservation practitioners from around the world to tackle various aspects of groundwater science and management. This included monitoring and metrics as well as assessing the climate change resilience of freshwater systems in the face of a changing climate, all while promoting ecological restoration efforts.

As a Restoration Ecologist with The Nature Conservancy, Holly initiated the binational San Pedro River Wet Dry Mapping Program in collaboration with the U.S. Bureau of Land Management in 1999. This citizen science program, which focuses on the water needs of a riparian ecosystem under a changing climate, continues to remain active 27 years later, engaging dozens of participating groups and agencies along with hundreds of volunteers. For the maps that The Nature Conservancy produces annually as part of this ongoing effort, showcasing the wetted length of this river during the driest time of year and supporting sustainable water management, visit: https://azconservation.org/project/wet_dry_mapping/

During her tenure with The Nature Conservancy, Holly was a founding member of the Upper San Pedro Partnership (https://uppersanpedropartnership.org/) in 1998 and has held multiple leadership positions in this collaborative effort, which continues to engage dozens of local, state, and federal member agencies and organizations since its inception. She served as Chairperson for their Technical and Executive Committees, where she coordinated the development of interagency research, modeling and monitoring to better understand climate change resilience, ecological restoration needs, and sustainable water management. Holly played a pivotal role in securing million-dollar budgets to support the technical needs of various federal and local agency programs and projects. She continues to serve as one of the Science Advisors for the Partnership's Technical Committee.

Thanks to a scholarship from The Nature Conservancy's Ecosystem Research Program, Holly developed an interdisciplinary ecosystem model for the Yampa River that incorporated geomorphology, hydrology, and riparian ecology as part of her PhD dissertation from Colorado State University's College of Forestry and Natural Resources. This research, which emphasized effective ecological restoration and sustainable water management, was published in the journal Conservation Biology in the article titled "Prescribing flood regimes to sustain riparian ecosystems along meandering rivers" (14: 1467-1478).