Members of the Southwest Hydrology Advisory Board represent a cross section of our readership and five southwestern states. All members are volunteers who serve one- or two-year terms, providing guidance and support for the publisher.

David Bolin
Orange County Water District

David Bolin has 25 years of experience in hydrogeology, environmental sciences, and petroleum exploration. Areas of expertise include water supply, regulatory negotiation and compliance, litigation support, soil and groundwater assessment and remediation, and landfill siting. Additional areas of expertise include petroleum- and chlorinated-compound impact issues.


After 19 years in consulting in California, Bolin joined Orange County Water District to address increasing water quality impacts to water supplies in the lower Santa Ana River Watershed. Bolin completed his Bachelor's Degree in Geology at the University of Massachusetts in Amherst, Master's work in Geology at the University of Georgia, and a Law degree at Irvine College of Law. He holds professional registrations in several states, including Arizona and California.


Chuck Graf
Arizona Department of Environmental Quality

Chuck Graf is an Associate Director of the Arizona Water Institute, where he coordinates Institute activities with the Arizona Department of Environmental Quality. Previously, Mr. Graf was the Deputy Director of the Water Quality Division at ADEQ. Mr. Graf received a B.S.E. degree in Engineering Science from Arizona State University in 1972 and is a Registered Geologist in Arizona . He has worked in engineering, hydrological, and water resources positions with the U.S. Forest Service, Arizona Department of Water Resources, Tetra Tech International, and Arizona Department of Environmental Quality. During his employment at ADEQ between 1984 and 2006, Mr. Graf directed groundwater, surface water, and drinking water quality assessment, protection, cleanup, and regulatory activities.




Howard L. Grahn, R.G.
Errol L. Montgomery & Associates, Inc., Advisory Board Chair

Howard Grahn is a hydrogeologist with Errol L. Montgomery & Associates, Inc. in Tucson, Arizona, and co-founder and current technical editor of Southwest Hydrology. Grahn has more than 20 years experience as a field geologist and hydrologist, and he has been active for more than a decade in the Arizona Hydrological Society and other professional organizations. He is a Registered Geologist in Arizona.



Jim Holway, Ph.D.
Sonoran Institute

Jim is director of the joint venture between the Sonoran Institute and the Lincoln Institute of Land Policy. Based at the Sonoran Institute, he works to fully leverage the research and public policy strengths of the Lincoln Institute with the on-the-ground and stakeholder engagement strengths of the Sonoran Institute.

Prior to joining the Sonoran Institute in 2009, Jim directed the Sustainability Partnership at Arizona State University and was the ASU coordinator for the Arizona Water Institute. He has also served as assistant director of the Arizona Department of Water Resources, where he oversaw the state's Active Management Area, conservation, assured water supply, recharge, well permitting, and groundwater and surface water rights programs. Jim serves on a number of committees and advisory boards including the Governor's Growing Smarter Oversight Council, the Arizona Town Hall and the Trust for Public Land's Arizona Advisory Council.




Jeff Johnson
Southern Nevada Water Authority

Jeff Johnson, is a Division Manager, in the Surface Water Resources Department of the Southern Nevada Water Authority (SNWA), where he specializes in water resource investigations for groundwater development, surface water diversions, and Colorado River resources.  He is a hydrogeologist with over 17 years of experience including optimization of production/ artificial-recharge wells in the Las Vegas Valley, water resource acquisitions, Colorado River modeling, and regional groundwater develop studies for water conveyance to Clark County, Nevada.  His current activities include water resource planning and water development strategies for Colorado River resources, the Muddy and Virgin Rivers, and Coyote Spring Valley.




David Jordan, P.E.

David Jordan is a Senior Hydrogeologist with INTERA Inc. in Albuquerque, New Mexico and oversees New Mexico water resources work for INTERA. He is a registered Professional Engineer in New Mexico and Oklahoma with over 15 years of experience in project management, water resources, quantitative hydrogeology, numerical modeling, GIS and database development. Jordan has also provided environmental litigation support on a variety of cases, many of which involved allocating responsibility among numerous potentially responsible parties (PRPs) who contributed to large and complex ground water contamination problems. Jordan has broad experience with a wide variety of water resources simulation models, as well as the integration of GIS with these models for planning and decision-making purposes.



Karl Kohlhoff, P.E., B.C.E.E.
HDR Engineering (retired)

Karl Kohlhoff was the National Technical Coordinator with HDR Engineering in Phoenix, Arizona. He received B.S. and M.S. degrees in civil engineering from the University of Arizona and the University of Southern California, respectively, and has more than 50 years of experience in water and wastewater system engineering.




Stanley Leake
U.S. Geological Survey

Stan Leake, of Tucson , Arizona , is a research hydrologist with the U.S. Geological Survey, where he has worked for more than 30 years. His main areas of work include water availability, interaction of ground water and surface water, land subsidence, and development of new capabilities for simulating processes related to ground-water flow. For the popular ground-water model program, MODFLOW, Leake has developed capabilities to simulate land subsidence, reservoirs, time-varying boundary conditions, and detailed local models within larger regional models. His current activities include regional perspectives on ground-water/surface-water interaction, effects of ground-water withdrawals on surface water features, geohydrology and water management in an agricultural area, and further development of ground-water simulation capabilities applicable in the arid and semi-arid Southwest.




Ari M. Michelsen, Ph.D.
Texas A&M Univ.

Dr. Ari Michelsen is Resident Director of the Texas A&M University Agricultural Research and Extension Center at El Paso, and Professor of Agricultural Economics specializing in water resources management, valuation, conservation, and policy analysis. His research includes the effectiveness of water conservation programs (agricultural and residential),water right markets, valuation and prices, impacts of endangered species water acquisition programs, air and water quality regulatory assessment and decision support systems for river basin resource management and water policy analysis in the U.S. and China. Michelsen is active in the Texas Economists Association, the Universities Council on Water Resources, the Allocating Water: Economics and the Environment 2004 conference, the New Mexico-Texas Water Commission, the Far West Texas Water Planning Group, the Paso del Norte Water Task Force, and the Paso del Norte Watershed Council.




Mark T. Murphy, Ph.D.
Canadian River Basin Program Manager, Office of the State Engineer, Interstate Stream Commission

Mark Murphy works for the New Mexico Office of the State Engineer, Interstate Stream Commission and manages state programs in the Canadian River Basin. This includes responsibility for the planning and operation of two reservoirs and an interstate compact between New Mexico, Texas, and Oklahoma. In his 30-year career, he has been employed in the Albuquerque and Phoenix offices of URS Corporation and was a research hydrologist with Battelle/Pacific Northwest, Los Alamos, and Lawrence Berkeley National Laboratories. He taught hydrology and geology classes at Heritage College on the Yakama Indian Nation and Arizona State University in Tempe and is a Registered Geologist in Arizona. His research interests focus on the way that hydrology, hydrogeology, and geomorphology combine to support aquatic and terrestrial habitat in the arid Southwest.





Peggy Roefer
Southern Nevada Water Authority

Peggy Roefer is the Regional Water Quality Program Manager for the Southern Nevada Water Authority, where she specializes in watershed water quality . She has worked for SNWA for 22 years, first as a Supervisor in Microbiology, then as a Regional Water Quality Supervisor, and currently holds the position of Regional Water Quality Program Manager. Her current activities include interagency coordination of water quality data collection and storage, invasive species, and watershed management.



Martin G. Steinpress, R.G., C.HG.
Brown and Caldwell

Martin Steinpress is a Chief Hydrogeologist and National Groundwater Resources Service Leader based in Brown and Caldwell’s Walnut Creek, California office. Steinpress is a Registered Geologist in California, Arizona, Texas and Washington and a California Certified Hydrogeologist with 25 years experience in geology and hydrogeology. He is a technical expert in hydrogeology with extensive experience in developing and applying conceptual models to complex groundwater problems. His water resources planning background includes creating cooperative partnerships between water agencies to facilitate the development of regional conjunctive use projects. Steinpress also has extensive experience in applying database, GIS, and web-based tools to water resources and other environmental challenges. He is past vice president of the Groundwater Resources Association of California and currently chair of the Communications Committee and editor of GRA’s quarterly newsletter HydroVisions.



Gary Woodard
Director, Knowledge Transfer, SAHRA, University of Arizona

Gary is Associate Director of the NSF Science and Technology Center for Sustainability of semi-Arid Hydrology and Riparian Areas at the University of Arizona. Woodard's responsibilities include knowledge transfer and selected education programs and international activities. He also pursues a research agenda focusing on forecasting municipal water demand and evaluating water rate structures, conservation programs and devices. Current research includes developing low-cost sensor and logger technology to disaggregate and forecast domestic water demand

At SAHRA, Woodard's KT team develops new ways to increase hydrologic literacy and serve water professionals. Besides Southwest Hydrology, efforts include: Water News Watch, a Web-based service that summarizes and catalogues thousands of articles from hundreds of news sources written in eight languages; science displays and interactive kiosks for museums and discovery centers; symposia and short courses; and Web-based tools and resources for a global network of UNESCO-sponsored research centers. Woodard also co-directs a Masters program in water resources management for mid-career water professionals.



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