8/07-present Professor, Department of Geological Sciences, University of Florida
8/00-8/07 Associate Professor, Department of Geological Sciences, University of Florida
8/94-8/00 Assistant Professor, Department of Geological Sciences, University of Florida
1/94-8/94 Geologist, USGS/Research Fellow UCSC
9/93-12/93 Post-Doctoral Researcher UCSD/Research Fellow, UCSC
9/87-9/93 Research/Teaching Assistant, UCSD
1/86-9/87 Research/Teaching Assistant, Duke University

Fellow, Geological Society of America
UF Research Foundation Professor, 2006-2009
Oak Ridge Associated Universities Junior Faculty Award, 1995
Who's Who Among Students, 1993
SEPM Student Excellence and Development Award, 1993
Amoco Fellowship, Duke University, 1986-1987
Departmental Honors, Wesleyan University, 1980

Inorganic Geochemist: Leg 134, Ocean Drilling Program
Manon Expedition, Barbados accretionary wedge
Co-chairL special session AGU, Fall, 1991: ODP Drilling on Western Pacific Convergent Plate Boundaries
Participant:JOI-USSAC Workship: Geochemistry, Progress and Opportunities (invited)
Penrose Conference: Flow and associated transport in basins: Driving forces, coupling and geologic controls (student support provided by GSA)
JOI-USSAC Workship: Western Pacific Drilling Results (invited
Member, Environment Science Steering and Evaluation Panel, ODP, 1996-1999
Member Florida Springs Task Force, 1999 - present
Member US Science Advisory Committee, ODP, 1999 - 2003
Organizer of two special Sessions GSA meeting, 2001: (1) "Groundwater discharge to estuaries", (2) "Geochemistry of karst waters: A window on hydrogeology and biota"
Member, International Association for the Physical Scineces of the Oceans - International Asssociation of Hydrologic Sciences (IAPSO-IAHS) Joint commission on Ground Water- Sea water Exchange, 2002 - present
Panel member for NSF Ocean Scineces section for Insstrument and Facilities, 2003
Panel member for NSF Graduate Student Fellowships, 2003- 2004
Member, Board of Governors, Karst Waters Institute, 2002 - present
Organizer of International Meeting "Karst Frontiers: Florida and Related Environments", held in Gainesville, Florida, Novermber, 2003
Guest Editor, Ground Water Special Issue, "Ground Water Discharge to Estarine and Coastal Ocean Environments" , published 2004
Associate Editor, Ground Water, 2005 - present
Organizer of Special Session at Geological Society of America National meeting, 2005, "Water, Solute, and Sediment Fluxes Through Carbonate and karst Aqufiers.

American Geophysical Union
Geological Society of America
Association of Limnologists and Oceanographers
National Ground Water Association