The University of Arizona

The Laboratory of Tree-Ring Research

LTRR Faculty and Scientific Staff

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Below is a list of faculty and scientific staff of the Laboratory of Tree-Ring Research. In most cases, a direct e-mail link is provided, and direct links to personal web pages are provided for people who have them. See the complete personnel directory for complete contact information of everyone currently working at the Laboratory
Current Faculty

Malcolm K. Hughes, Professor and Director

  • B.Sc., Botany & Zoology, Univ. of Durham, 1965; Ph.D., Ecology, Univ. of Durham, 1970
  • Other UA Depts.: GEOS, ISPE
  • Past climate in Europe, the Himalayas, and the Sierra Nevada from tree rings
  • Fine detail of wood structure revealed by microdensitometry
  • Collaborator in effort to improve knowledge of the Earth's climate since AD 1000 from tree rings, ice cores, laminated sediments, and historical records
  • Potential of 3000 year and older giant sequoia as proxy climate records
  • Personal home page
Jeffrey S. Dean, Professor

  • B.A., Anthropology, Univ. of Arizona, 1961; Ph.D., Anthropology, Univ. of Arizona, 1967
  • Other UA Depts.: GEOS, ANTH
  • Archaeological dating theory and tree-ring dating
  • Effects of human behavior on date assemblages
  • Applying tree-ring data to investigate fluvial processes
  • Utilization of long archaeological tree-ring chronologies for dendroclimatic reconstructions
  • Integration reconstructions based on multiple paleoenvironmental measures
  • Effects of environmental fluctuations on past and present human populations
Katherine Hirschboeck, Associate Professor

  • B.S., Geography, Univ. of Wisconsin-Madison, 1973; M.S., Geography, Univ. of Wisconsin-Madison, 1975; Ph.D., Geosciences, Univ. of Arizona, 1985
  • Other UA Depts.: GEOS, GEOG, HWR, ATMO, ALS, ISPE
  • Atmospheric patterns and processes associated with climatic variability and Global Change
  • Integrate synoptic climatology with hydrology, geomorphology, and dendrochronology to study environmental responses to varying atmospheric circulation patterns
  • Relationship between flooding and climate at global, regional, and local scales
  • Frost rings in trees as records of anomalous cooling due to major volcanic eruptions
  • Personal home page
Steven W. Leavitt, Professor

  • B.S., Geology, Univ. of Illinois, 1971; M.S., Environmental Sciences, Univ. of Virginia - Charlottesville, 1977; Ph.D., Geosciences, Univ. of Arizona, 1982
  • Other UA Depts.: GEOS, ISPE
  • Analysis of carbon-13/carbon-12 ratios in tree rings
  • Reconstruct past climate (drought)
  • Reconstruct past atmospheric chemistry (the changing isotopic ratios of atmospheric CO2 resulting from fossil-fuel and biospheric inputs)
  • Seasonal isotopic signals within tree rings to reconstruct seasonal environments
  • Combining growth chamber and field experimentation
David Meko, Research Specialist Principal

  • B.S., Meteorology, Penn. State Univ., 1972; M.S., Atmospheric Sciences, Univ. of Arizona, 1974; Ph.D., Hydrology, Univ. of Arizona, 1981
  • Other UA Depts.: GEOS
  • Time-series methods and study of the relationship between tree-ring and hydrologic series
  • Reconstructing streamflow and drought frequency from tree rings
  • Testing the statistical evidence for a link between solar/lunar cycles and drought as reflected in tree rings
  • Effect of climatic variability on water supply, particularly in the semi-arid southwestern United States
  • Personal home page
Charles W. Stockton, Professor

  • B.S., Geology, Colorado State Univ., 1960; M.S., Hydrogeology, Colorado State Univ., 1965; Ph.D., Hydrology, Univ. of Arizona, 1971
  • Other UA Depts.: GEOS, HWR
  • Influence of climatic variability on hydrologic processes
  • Determination of long-term drought frequencies and their effect on water supply
  • Developing methods for forecasting future drought occurrences
  • Regions of special research interest: Arizona, western United States, Morocco
Thomas W. Swetnam, Associate Professor

  • B.S., Biology, Univ. of New Mexico, 1977; M.S., Forestry-Watershed Management, Univ. of Arizona, 1983; Ph.D., Watershed Management, Univ. of Arizona, 1987
  • Other UA Depts.: GEOS, RNR, GEOG
  • Natural and human disturbances of forest ecosystems
  • Multi-century histories of fire and insect outbreak occurrences from tree-ring records
  • Southwestern U.S. forests, coast redwood and giant Sequoia stands in California
  • Providing basic ecological information as well as guidance to National Forest and Park Managers
  • Personal home page
Ronald H. Towner, Adjunct Assistant Professor

  • B.A., History, Lewis & Clark College, 1979; M.A., Anthropology, Washington State Univ., 1986; Ph.D., Anthropology, Univ. of Arizona, 1997
  • Other UA Depts.: GEOS, ANTH
  • Archaeological dendrochronology
  • Chronometry and archaeological dating theory
  • Human/environment interaction
  • The Athapaskan occupation of the Southwest
  • Historical archaeology
Faculty Emeriti

Bryant Bannister, Professor and Director Emeritus

  • B.A., Anthropology, Yale Univ., 1944; M.A., Anthropology, Univ. of Arizona, 1953; Ph.D., Anthropology, Univ. of Arizona, 1960
  • Development and refinement of dendrochronology as an archaeological dating tool
  • Derivation, interpretation, and application of archaeological tree-ring dates
  • Construction of prehistoric chronological controls for the American Southwest, Mexico, and the Near East
Harold C. Fritts, Professor Emeritus

  • B.A., Botany, Oberlin College, 1951; M.S., Botany, Ohio State Univ., 1953; Ph.D., Botany, Univ. of Ohio, 1965
  • Dendrochronology theory
  • Reconstruction and mapping of past North American climate from large grids of tree-ring data
  • Relationships of tree growth and environment
  • Modeling tree growth with rising CO2 levels, acid rain, and environmental pollution
  • Personal home page
Scientific Staff

Rex K. Adams

  • B.A., Sociology/Anthropology and Chemistry, Adams State College, 1967; M.A., Anthropology, Eastern New Mexico Univ., 1980
  • Basic field and laboratory methods and techniques
  • Public outreach to schools and groups for presentations
  • Talks and tours at the Laboratory of Tree-Ring Research
Christopher H. Baisan

  • B.S., Watershed Management, Univ. of Arizona 1991
  • Ecology of forest and woodland disturbances particularily fire and insect outbreaks as well as cultural influences on disturbance processes
  • Extracting seasonal climate from tree rings
  • Examining relationships between fire, fuel accumulation rate, and climatic patterns
Dennie O. Bowden

  • B.A., Anthropology, Univ. of Arizona 1967; M.A., Anthropology, Univ. of Arizona, 1973
  • Dating archaeological tree-ring samples from southwestern United States
James M. Burns

  • B.A., Anthropology, Univ. of Arizona, 1976; A.A.S., Digital Electronics, Pima Community College, 1982
  • Densitometric data
  • Image analysis
Kaimei Dai

  • B.Sc., Physics, Nanjing University - China, 1964; Assoc. Professor, Physics, Nanjing University - China, 1988
  • Radiocarbon in tree rings to reconstruct solar variation
  • Relationships between solar cycles and climate
  • Isotopic variations from bomb testig and nuclear power generation
  • Radiocarbon dating
  • Data analysis in dendrochronology
Gary Funkhouser

  • B.A., Anthropology, Washington and Lee Univ., 1975; M.A., Anthropology, Univ. of Georgia, 1978
  • Development and analysis of tree-ring chronologies
  • Semi-arid regions of the US and the subarctic regions of Russia
  • Extending the 8000-year long Pinus longaeva chronology for climatic reconstruction and calibration of the radiocarbon time-scale
  • Development of long chronologies from Siberia
  • Worked in Jordan as co-director of a paleolithic excavation at Ain-El-Assad
Mary Glueck

  • B.S., Meteorology, Penn State Univ., 1986; M.S., Climatology, Univ. Alaska Fairbanks, 1989; Ph.D., Air-Sea-Ice Interaction, Univ. Alaska Fairbanks, 1999
  • Climate reconstruction from tree-rings
  • Synoptic climatology, meteorology,
  • Physical oceanography,remote sensing
  • Regional climate variability:
    • High Latitude
    • North America
    • Morocco
Deborah Hemming

  • B.Sc., Geography, Coventry Univ. - U.K., 1992; M.Sc. (distinction), Applied Meteorology and Climatology, Birmingham Univ. - U.K., 1994; Ph.D., Godwin Institute for Quaternary Research, Univ. of Cambridge - U.K., 1999.
  • Modelling stable isotope composition of tree rings
  • Measurement and analysis of stable isotope ratios in tree rings
  • Feasibility and application of stable isotope measurements of pollen
  • Examining tree responses to climate and atmospheric CO2 changes
Kiyomi Morino

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Martin A. R. Munro

  • M.A., Archaeology, Univ. of Edinburgh, 1977; Ph.D., Queen's Univ. of Belfast, 1983
  • Image analysis for cell size measurement and densitometry in dendrochronology
  • Data analysis tools for dendrochronology
  • Computer system support
  • Personal home page
James A. Parks

  • B.A., History, Univ. of Arizona, 1990
  • Crossdating of archaeological and modern samples from the southwestern USA and the Great Basin
  • Ecology of Pinus cembroides in southeastern Arizona
  • Log buildings (Quercus stellata) in central Texas
  • Prehistoric and protohistoric human behavior
Paul R. Sheppard

  • B.S., Forestry, Humboldt State Univ., 1982; M.S., Natural Resources, Cornell Univ., 1984; Ph.D., Geosciences, Univ. of Arizona, 1995
  • Low-magnification, reflected-light image analysis of tree rings
  • Tree-ring of past geomorphological events
  • Soil-tree growth relationships
  • Dendrochemical measurements and environmental interpretability
David Street

  • H.N.C., Naval Architecture, Ministry of Defence, Bath, 1987; B.Sc.(Hons), Archaeological Science, Univ. of Bradford, 1996
  • Archaeological tree-ring dating and related theory
Ramzi Touchan

  • B.S., Agriculture Engineering, Univ. of Aleppo, 1977; M.S., 1986; Ph.D., Watershed Management, Univ. of Arizona, 1991
  • Fire history chronologies in western US
  • Dendroclimatic reconstruction from long chronologies from giant Sequoia
  • Dendrochronology in Siberia, the Near East, and Finland
Richard L. Warren

  • B.A., Archaeology, Univ. of Arizona, 1964
  • Crossdating archaeological materials
Retired Staff

Thomas P. Harlan

  • B.A., Anthropology, Texas Technological College, 1956; M.A., Anthropology, Univ. of Arizona, 1962
  • Tree-ring chronologies from all continents except Antarctica
  • Developing long chronologies, especially bristlecone pine
Richard L. Holmes

  • B.A., Geography, Univ. of Arizona, 1967
  • Tree-ring chronologies in Argentina and Chile
  • Tree-ring chronologies in California, eastern Oregon, and the northern Great Basin
  • Research consultant and computer programmer
  • Interactive computer programs for dendrochronology known as the Dendrochronology Program Library
  • Programs for tree-ring analysis of daily temperature fluctuations, forest fire history, outbreaks of forest pests, responses of closed-canopy forests, and image analysis
Robert G. Lofgren

  • B.S., Mechanical Engineering, Univ. of Illinois 1954; M.S., Physics, Northwestern Univ., 1962
  • Climatic variations and data sets

Laboratory of Tree-Ring Research, The University of Arizona
Tucson, Arizona 85721 USA
Main Office: (520) 621-1608, Fax: (520) 621-8229
Comments to Paul Sheppard: