Contact Information

University of Maryland
Department of Geology and Earth System Science Interdisciplinary Center
Geology Bldg. (#237), Rm 1120
8000 Regents Dr
College Park, MD 20742
Phone: (301) 405-8763

Google Scholar public profile 
ORCID profile

Research Interests

  • Paleoclimatology: Tropical climate forcing and response; ENSO; Light stable isotopes as paleoclimatic and physiologic indicators in trees and corals; Proxy system modeling; Dendrochronology; Observing network design; Uncertainty quantification
  • Climate and global change: Biogeochemistry of regional methane fluxes; Pollution dispersal and remediation modeling; Coral reef stress diagnostics, analysis, modeling

Appointments at UMD

2008–2019, Associate Professor, Geology (GEOL) & Earth System Science Interdisciplinary Center (ESSIC)
2009–2019, Affiliate Assoc. Prof., Atmos. & Oceanic Science (AOSC)
2009–2019, Affiliate Assoc. Prof., Appl. Math & Statistics and Sci. Computation Program (AMSC)
2019– Professor, GEOL & ESSIC; Affiliate Prof, AOSC, AMSC

Other Employment

1992–1999, Graduate Fellow, Columbia University
1999–2000, Postdoctoral Research Scientist, Lamont-Doherty Earth Observatory, Columbia University
2000-2019, Adjunct Associate Research Scientist, Lamont-Doherty Earth Observatory, Columbia University
2000–2001, NCAR Climate & Global Change Postdoctoral Fellow, Earth & Planetary Sciences, Harvard University
2001–2007, Assistant Professor, Laboratory of Tree-Ring Research, University of Arizona
2003–2008, Courtesy Asst. Prof., Geosciences, University of Arizona
2004–2008, Joint appointment, Atmospheric Sci., University of Arizona
2007–2008, Associate Prof., Laboratory of Tree-Ring Research, University of Arizona
2008–2019, Adj. Assoc. Prof., Laboratory of Tree-Ring Research, University of Arizona
2016, Oeschger Climate Change Research Center, Sigrist Fellow, Swiss National Research Foundation Visiting Scientist, University of Bern
2016, Vice Chancellor's Visiting International Scientist Award, University of Wollongong
2019–2024 Adjunct Senior Research Scientist, Lamont-Doherty Earth Observatory, Columbia University
2022, Bristol Benjamin Meaker Distinguished Visiting Professor, University of Bristol
2022-2023, Royal Society/Wolfson Visiting Fellow, University of Edinburgh
2023-2027, Visiting Professor, University of Edinburgh


1988–1992, A.B. magna cum laude, Special Concentration in Environmental Science and Policy, Harvard College
1992–1999 Ph.D., Earth and Environmental Sciences, Columbia University


2013–2017, Associate Editor, Journal of Climate
2017-2018, Guest Editor, Climate of the Past (2 special issues)
2018-2022, 2024-2025 Editor, Journal of Climate
2020-2021, Guest Editor, PAGES Magazine, 29(1): 30 years of PAGES: Past - Present - Future

Selected Professional Activities

Past Global Changes (PAGES):

  • 2011-2015, Founder and overall lead, Ocean2k Working Group
  • 2012-2017, 2K program coordinate committee
  • 2016-2021, Scientific Steering Committee (SSC) member
  • 2017-2019, Co-founder, Data Assimilation and Proxy System Modeling (DAPS) Working Group
  • 2018-2020, SSC Co-Chair
  • 2021-2022, delegate-designate to the Future Earth Assembly

Future Earth:

  • 2018, Global Research Program representative at Future Earth Advisory Council/Governing Council Meeting. Montevideo, Uruguay
  • 2019-2023, Knowledge Action Network on Emergent Risks and Extreme Events, past2future Working Group co-lead 
  • 2020-2021, 5-year review Task Force and Implementation Team
  • 2021-2022, Future Earth Assembly PAGES delegate 

Education and Outreach

  • 2001-, Design, delivery and evaluation of 13 courses in paleoclimatology, global change, statistics and modeling at Arizona, Tohono O'odham Community College, Maryland, and Wollongong
  • 2010-, Mentor, Eleanor Roosevelt and Poolesville High School internship program participants
  • 2012-2019, Annual exhibitor, Maryland Day, Earth Sciences
  • 2013, 2014, 2018, Activity leader (5x), Takoma Park 4H
  • 2013, 2014, College Park Scholars speaker and Service Day supervisor 
  • 2015-, Developer, organizer and leader, annual informal GEOL graduate fellowship proposal workshop
  • 2019-2021, GEOL Inclusivity, Diversity, Equity Awareness Committee member and Chair (2021)


  • 1993, NASA Earth System Science Graduate Research Fellowship
  • 1999, NOAA Climate and Global Change Postdoctoral Fellowship
  • 2004, NSF CAREER grant awardee
  • 2015, Visiting Scientist Fellowship, Swiss National Research Foundation
  • 2015, Sigrist Foundation Scholarship, University of Bern
  • 2016, Visiting International Scholar Award, University of Wollongong
  • 2018, Editor's Award, American Meteorological Association
  • 2018, University of Maryland Elevate Fellowship in course redesign
  • 2022, Podlich Fellowship, Claremont-McKenna College (declined)
  • 2022, Bristol Benjamin Meaker Distinguished Visiting Professorship, University of Bristol
  • 2022, Royal Society/Wolfson Visiting Fellowship, University of Edinburgh