• Research Assistant Professor, Biology


  • The influences of cultivation method on inflorescence lipid distributions, concentrations, and carbon isotope ratios of Cannabis sp., Forensic Science International, 262, 233-241. Published, 05/16/2016.
  • Predicting leaf wax n-alkane 2H/1H ratios: controlled water source and humidity experiments with hydroponically grown trees confirm predictions of Craig-Gordon model, Plant, Cell and Environment, 38, 6, 1035-1047. Published, 01/15/2015.
  • Isolation of the strontium pools and isotope ratios in modern human hair, Analytica Chimica Acta, 798, 1, 64-73. Published, 10/10/2013.
  • Environmental control on eastern broadleaf forest species’ leaf wax distributions and D/H ratios, Geochimica et Cosmochimica Acta, 111, 1, 64-77. Published, 06/15/2013.
  • Leaf n-alkane record the plant-water environment at leaf flush, The Proceedings of the National Academy of Sciences, 110, 7, 2659-2664. Published, 02/12/2013.

Research Statement

I focus on investigating the connections and interactions between the geological and biological sciences through the use of stable isotope ratios and elemental profiles of organic materials and inorganic phases. My research seeks to address questions of societal importance using geochemical tools and to translate these finding into civil, economic, and environmental improvements. My primary academic strengths are in the fields of isotope geochemistry, organic geochemistry, isotope forensics, paleoclimatology, and paleoecology.

Research Keywords

  • Organic Geochemistry
  • Isotope Geochemistry
  • Urban Ecology
  • Environment and Human Health
  • Water Cycle
  • Paleoclimatology

Research Groups

  • Ehleringer Lab, Research Professor. Department of Biology. 08/16/2010 - present.

Grants, Contracts & Research Gifts

  • Hydrogen isotopes in n-alkanes of tree leaves and needles: experimental studies with ecophysiological, ecosystem, climate, and dust-related applications. PI: James Ehleringer. Co-PI(s): Brett Tipple. National Science Foundation, 04/15/2011 - 03/31/2015. Total project budget to date: $707,500.00

Research/Scholarship Projects

  • Isotope analyses of hair as a trace evidence tool to reconstruct human movements: Establishing the effects of the “Human Ecosystem” on strontium and oxygen isotope ratios. PI: Brett Tipple. 10/01/2013 - present.

Research Equipment and Testing Expertise

  • Cavity ring-down spectroscopy (Water: O/H), Gas source isotope ratio mass spectrometry (Solids: C,N,O,H,S; Compound-Specific: C,H,N), Multicollector inductively-coupled plasma mass spectrometry (Sr).

Data: Tipple et al., 2010

Data File used in Tipple, B.J., Meyers, S.R., and Pagani, M. (2010) The carbon isotope ratio of Cenozoic CO2: a comparative evaluation of available geochemical proxies, Paleoceanography, doi:10.1029/2009PA001851.


  • American Sign Language, basic.

Geographical Regions of Interest

  • United States of America
    Intermountain West.
  • Uganda
  • Tunisia
  • South Africa