A.C. Redfield Lifetime Achievement Award


The Lifetime Achievement Award was first presented in 1994 to recognize and honor major, long-term achievements in the fields of limnology and oceanography, including research, education and service to the community and society. In 2004, the ASLO Board renamed the Lifetime Achievement Award in honor of Alfred C. Redfield. Redfield's biography was compiled by Dr. Peter Williams, who received the Redfield Award in 2009, and published in the December 2006 issue of the Limnology and Oceanography Bulletin.


Emphasis in selection is given to established aquatic scientists whose work is recognized for its importance and long-term influence. Candidates should have more than 25 years experience beyond the date of their most advanced degree. This award is open to pairs of individuals where joint work has been of a long-term, sustained collaborative effort.


Each nomination must be supported by a letter (not to exceed two pages) on qualifications. Ideally this letter should include statements that would form the basis of the citation and the presentation speech at the ASLO meeting. The nomination package may also include a list of important publications and other pertinent information, but in total this package shall be no more than 3 pages. The nomination should also be supported by 3 letters of endorsement of no more than 1 page each. These letters should indicate the breadth of support for the nominees and the perspectives of different individuals to clearly indicate the breadth of contributions of the nominee.


John Smol (2024), For leadership in the development and application of the field of paleolimnology; his work has established the use of lake sediment records and indicator species to identify water quality problems, monitor ecosystem fluctuations, and to track changing climate. Read complete citation

Nancy B. Grimm (2023), for transformative and critical insights on the impacts of human activities and climate change on the biogeochemistry in urban and inland waters. Read complete citation

Edward  J. Carpenter (2022), for his critical contributions that clarified the important role of open ocean nitrogen fixation in driving the ecology of the ocean and global biogeochemistry.  Read complete citation

Ronald Benner (2021), for transformative and enduring revelations regarding the origins, composition, and reactivity of organic matter in Earth’s ecosystems – from inland waters to the deep sea. Read complete citation | View award presentation

Sybil Seitzinger (2020), in recognition of her critical research on the nutrient biogeochemistry of coastal and freshwater ecosystems spanning from molecular organic chemical characterization to global scale models and the application of new knowledge. Read complete citation | View award presentation

Stephen Carpenter (2019), in recognition of his remarkable contributions to the field of limnology and lake management; including major advances in our understanding of trophic cascades, eutrophication, regime shifts, fisheries sustainability, and social ecological systems via approaches that confront theory with large-scale collaborative experimentation, long-term lake surveys, community outreach, and education. Read complete citation | View award presentation

Lisa Levin (2018), for her extraordinary long-term contributions to understanding the composition and function of seafloor ecosystems, and for her leadership in identifying and communicating anthropogenic pressures on aquatic ecosystems, with relevance to policies for sustainable and healthy seas.

Bo Barker Jørgensen (2017), for fundamental contributions to unraveling the ecology and biogeochemical interactions of microbes in environments ranging from surface sediments to the deep biosphere. View award presentation

Evelyn Sherr and Barry Sherr (2016), for their lifetime research on food-web interactions, protists, and the factors controlling the activity, growth, and survival of aquatic microorganisms.View award presentation

David Schindler (2015) is recognized for his unfaltering record of revolutionary limnological research that addressed the most important aquatic environmental issues of our time. View award presentation

Gene E. Likens (2014), for his extraordinary long-term contributions to the fields of limnology and oceanography–including research, education, and service within and beyond the aquatic sciences community. View award presentation

Bruce J. Peterson (2013), for innovative and transformative studies of carbon, nutrient and water cycles at process, ecosystem and global scales. View award presentation

Winfried Lampert and Maciej Gliwicz (2012) in recognition of their outstanding individual and collaborative research, which has laid the foundations for our current understanding of phytoplankton-zooplankton interactions, trophic ecology of zooplankton, and evolutionary relationships in freshwater ecosystems. View award presentation

Frederick Grassle (2011), in recognition of his fundamental discoveries in deep sea ecology, visionary leadership of marine sciences, selfless community service, and groundbreaking technical innovations that will shape oceanography for decades to come. View award presentation

James F. Kitchell (2010), For field-changing contributions in the areas of fish ecology and fisheries, trophic dynamics, and understanding the role of fish in aquatic ecosystems. 

Peter Williams (2009), for his outstanding contributions to our understanding of oceanic productivity, carbon cycling and metabolic balance and for his role in shaping current views on the importance of microbial processes in the oceans. View award presentation

John Hobbie (2008) for contributions in the field of aquatic microbial ecology and involvement with the development of important institutions and research programs. View award presentation

Jörg Imberger (2007) for major contributions in physical limnology and particularly for fundamental insights into lake stratification and mixing dynamics through observational, theoretical and modeling studies.

Tom Fenchel (2006), for opening our eyes to the fascinating world of low Reynolds numbers and rapid diffusion and to the amazing adaptations of chemotactic and locomotive behaviour developed by protozoa and bacteria to life in a heterogenerous world.

Andre Morel (2005), for leading our modern understanding of ocean color, particularly in Case 1 waters, where the optical properties are dominated by biology; and for fundamental work in the interpretation of satellite observations of ocean color.

Charles R. Goldman (2004), for his enduring efforts to understand and protect Lake Tahoe, his inspiring mentorship of numerous students who themselves have made lasting scientific contributions, and for his tireless advocacy for limnological research, training and stewardship worldwide.

John J. Gilbert (2003), for developing and sustaining the field of rotifer ecology and biology; for successful mentorship for more than a quarter century; and for vital service contributions to the national and international communities of limnologists and oceanographers.

John J. Magnuson (2002), Center for Limnology, University of Wisconsin-Madison (WI), for his extensive and effective service to the limnological and oceanographic communities, including leadership in national and international programs that have strengthened both science and policy, and for his seminal approaches to the community ecology of lakes and lake districts.

Jack Vallentyne (2001), Freshwater Institute (CA) (Retired), for his exemplary research contributions in paleolimnology, biogeochemistry and eutrophication; outstanding administrative accomplishments in forming and fostering the Experimental Lakes Area; and passionate efforts in educating children in environmental, ecological and limnological issues.

Ramon Margalef (2000) for his research and teaching on the subjects of plankton succession and the role of physical processes in structuring plankton communities that have guided the oceanography field for four decades.

Charles S. Yentsch (1999) for sustained and innovative contributions in the fields of phytoplankton pigments and productivity, optical properties and remote sensing, and for establishing and sustaining oceanographic initiatives and programs.

Karl Banse (1998) for his prolific, diverse, and seminal papers on key oceanographic issues, rigorous application of the scientific method, high intellectual standards, and excellence in teaching.

Alan R. Longhurst (1997) in recognition of sustained excellence in the study of marine food webs and biogeography, and of outstanding leadership in the development of international collaboration and in the administration of world-renowned oceanographic programs.

Ruth Patrick (1996) for her outstanding contributions to aquatic ecology and environmental problem solving, her pioneering work on algae as indicators of water quality, and her leadership as an educator within and outside of academia.

Clifford H. Mortimer (1995) in recognition of his lasting and substantive contributions across disciplines of aquatic biology, chemistry and physics, his leadership, and his general commitment to excellence.

Kenneth H. Mann (1994) in recognition of his significant achievements in the aquatic sciences, his contributions to the stature of these fields, and his role as a model for those at earlier career stages.

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