Former Graduate Students

  • Gordon “Max” Showalter Defended his Master’s Degree on Feb 21, 2017, completing his work on bacterial swimming behaviors (motility) in cold and subzero temperatures to help understand microbial colonization of sea ice and pursue the use of motility as a biosignature in extreme and extraterrestrial environments. Check out his Town Hall talk.  He attended NSF’s 10th Antarctic Biology Training Program at Palmer Station this summer 2016. Max defended his PhD dissertation in Oct 2020.  Autumn of 2020 Max holds an interem postdoc at UW in the Deming Ecosystem before he begins his Knauss Marine Policy Fellowship in Washington, DC in February 2021. (gshowalt AT 
  • Erin Evan Firth, MS. 2016,  studied the seasonal synergy between bacterial osmoprotection and algal production in sea ce (firth.evan AT, supported by NSF
  • Jeff Bowman, Ph.D. 2014, studied survival mechanisms of bacteria in cold, salty environments, supported by NSF-IGERT and the UW Astrobiology Program. See a past Swedish collaboration aboard the icebreaker, Oden, here. (currently at the Lamont-Doherty Earth Observatory, bowmanjs AT and website)
  • Marcela Ewert Sarmiento, Ph.D. 2013, studied ice selection of exopolymers and microbes, supported by a Vatican Observatory fellowship in Astrobiology and the School of Oceanography, (currently teaching at Edmonds Community College, marcella.ewert AT
  • Jesse Colangelo-Lillis, MS, 2012, studied cold adapted bacteriophage systems, supported by NSF-IGERT and the UW Astrobiology Program, (currently at the University of Colorado Boulder, jesse.colangelo AT
  • Colleen T. E. Kellogg, Ph.D., 2011, studied microbial diversity and extracellular enzyme activity associated with particles on Arctic shelves (currently a research scientist at the Hakai Institute Vancouver, BC, colleen.kellogg AT
  • R. Eric Collins, Ph.D., 2009, studied wintertime Arctic sea ice community succession and the potential for gene exchange using molecular methods (currently an Assistant Professor and Canada Research Chair in Arctic Marine Microbial Ecosystem Services at the University of Manitoba, eric.collins AT
  • Llyd E. Wells, Ph.D., 2006, studied cold-active bacteriophage and their hosts (currently teaching at St. John’s College, Santa Fe, NM, llyd.wells AT
  • Adrienne Huston, Ph.D., 2003, studied thermal characteristics of enzymes (currently at Verenium Corporation, Adrienne.Davenport AT
  • Karen Junge, Ph.D., 2002, studied bacterial activity and diversity at subzero temperatures in Arctic sea ice (currently at the UW Applied Physics Lab Polar Science Center, kjunge AT
  • David Allen, M.S., 2002, studied low-temperature motility and chemotaxis of a psychrophilic marine microorganism Colwellia psychrerythraea strain 34H. (currently a senior program officer at the National Academies of Sciences, Engineering, and Medicine).
  • Yves-Alain Vetter, Ph.D. 1998, studied extracellular enzymes as an optimal foraging strategy for bacteria (currently working in Seattle - Vesta Home Performance)
  • Patricia L. Yager, Ph.D. 1996, studied the role of bacteria in Arctic carbon cycling (currently Professor of Marine Sciences, University of Georgia, pyager AT
  • Jill L. Schmidt Murray, MS 1996, studied new ways of evaluating bacterial abundance in marine sediments (Ph.D. 2001, with P. Jumars; currently Project Coordinator with the City of Santa Barbara’s Clean Creeks/Water Quality Improvement Program, JMurray AT
  • Will Ritzrau, German Fullbright Fellow at UW, 1991-1992, studied bacterial activity on resuspended sediments (Ph.D. 1994, University of Kiel; currently employed in Germany as a computer specialist, will.ritzrau AT
  • Michelle Bieniek, MS, 1995, studied protist grazing effects on bacterial PAH degradation (currently in the private sector in San Diego)

Former Postdoctoral Associates

  • Anders Torstensson. Was a part of the Mosaic Expedition aboard the icebreaker Polarstern in 2020. Participant of the Expedition: Arctic Ocean 2018 aboard the icebeaker ODEN.  A member of the Subzeo, Hypersaline Arctic Research Collaboration (SHARC) Project funded by the Moore Foundation. Worked with Jodi Young and Jody Deming on the uptake, production and recycling of compatible solutes in sea ice algae as part of the Future of Ice Initiative. (andtor AT 
  • Karen Junge, currently at the UW Applied Physics Lab Polar Science Center, studied bacterial activity at subzero temperatures in the Deming Lab, kjunge AT
  • Joseph G. Marx, currently with the Federal Bureau of Investigation; studied exopolymer and enzyme production by Colwellia psychrerythraea strain 34H under extreme conditions in the Deming Lab, jgmarx AT
  • Christopher Krembs, currently lead Oceanographer at the Washington State Department of Ecology; studied exopolymers in sea ice in the Deming Lab,
    christopherkrembs AT

Former UW Astrobiology Rotation Students/Visiting Students

  • Paul Kintner (UW AB program) examined the fractionation of bacteria in sea ice as it freezes with respect to freezing rate and the presence of gels. (kintner AT
  • Brett Morris (UW AB program) Developed algorithmic detection of bacterial motility and taxis using the digital holographic microscope SHAMU (source code: shampoo). (bmmorris AT uw DOT edu).
  • Wolf Gordon Clifton Examination of the growth of cold-adapted bacteria under different pressures and temperatures. (wolfclif AT uw DOT edu).
  • Lorrie Maccario (PhD student at the Environmental Microbial Genomics Group in Lyon, France),  collaborated with us on compatible solute transcriptomic work, as well as phototaxis studies on the green snow alga, C. nivalis (lorrie.maccario AT ec-lyon DOT fr).  CONGRATULATIONS!  Lorie passed her PhD defense Sept 2015!
  • Regina Carns, Examination of the influence of extracellular polysaccharides on ions in sea ice brine pockets (rcarns AT uw DOT edu).
  • Chantz Thomas worked with Jeff Bowman on the potential synthesis of pre-biotic organic molecules at the surface of sea ice.  Chantz is also a graduate student in Chemistry at UW  (chantzt AT uw DOT edu).
  • Zach Adam Design and construction of a “cold-finger” experimental apparatus allowing the investigation of the partitioning of inorganic salts between ice and brine phases and the partitioning of proteins between these phases as ground-truthing exercises for astrobiological investigatin of extra-terrestrial ices. (currently at the Office of Commercial Space Trasportation with the Federal Aviation Administration, zach.adam AT
  • Steve Vance Collection and filtration of microbial life in perennial sea ice in Franklin Bay with assistance from other shipboard researchers during Canadian Arctic Shelf Exchange Expedition Leg 3 (Nov-Dec 2003), Franklin Bay, Northwest Territories. (currently at the Jet Propulsion Laboratory in Pasadena, CA, steven.d.vance AT
  • John Armstrong Growth characteristics of cold-adapted bacteria at low temperatures. (currently teaching at Weber State University, UT, jcarmstrong AT

Former Undergraduate and High School Students

  • Annie Shoemaker Spring 2020. Worked with Zac Cooper on the growth conditions of a Psychrobacter isolate (CB7) from the Alaskan cryopeg. Workied with Anders Torstensson (Summer 2018-2019) generating growth curve data for bacterial isolates in culture with psychrophilic diatoms, as well as some temperature characterizaton of these isolates. currently at Seattle Genetics in Bothell, WA..
  • Liz Miller Summer 2018. Workied on characterizing our sea ice brine isolate, Psychrobacter sp. - P7E, using temperature range of growth, salinity range of growth and acclimatizaton testing. (miller.eliz.c AT  Liz is currently a graduate student at the University of Hawaii at Manoa.
  • Kobe Ryan - ASTR 499 research credit, "UV irradiation of cold-adapted bacterium Colwellia demingiae" (Koberyan AT
  • Violet Schermer - high school intern - ran EPS standards and assisted with HEALY EPS samples, pressure vessel maintenance, and was tip-stacker extraordinaire! (violetschermer AT
  • Anais Gentilhomme - Ocean 444 senior thesis, “The effects of lead (II) nitrate on EPS production by Colwellia psychrerythraea 34H and the metal-binding capacity of the EPS in artificial seawater” (anais AT Anais recently defended her MS in Oceanography at the University of Alaska Fairbanks (2020) studying genome signatures of optical growth temperature in the family Colwelliaceae.
  • Leyia Johnson (UW undergraduate) work/study student examined long-term stored pressure vessels for interesting cold-adapted, enriched bacterial isolates. (Leyia AT
  • Joseph Schermer summer high school intern, 2014, studied temperature and salinity parameters of specific cold-adapted marine bacteria.
  • Adrienne Scott community college intern, 2013, examined oil-dispersing potential of cold-adapted marine bacteria.
  • Pierre Monnat, summer high school intern, 2004, studied carbon requirements for Arctic bacterial isolates
  • Mike Cordray, summer undergraduate, 2003 and 2004, work study analyzing Arctic samples by Fluorescent In Situ Hybridization (FISH)
  • Sarah Bowerman, winter-spring quarter undergraduate, 2002, work study analyzing Arctic samples by Fluorescent In Situ Hybridization (FISH)
  • Chris Powell, 2002, work study on the Deep Gulf of Mexico Benthos (DGoMB) project estimating sediment bacterial biovolumes
  • Nichole Mogen, summer undergraduate, 2002, work study on the Deep Gulf of Mexico Benthos (DGoMB) project estimating sediment bacterial biovolumes
  • Georgia Lemen, summer high school intern, 1999, studied growth characteristics of cellulose degrading mesophilic bacterial isolates
  • Wendy Smith, summer undergraduate, 1996, studied bacterial densities and rates of phenanthrene degradation in Puget Sound sediments
  • Lesa Sutton, undergraduate helper, 1997-1998, studied extracellular enzyme activities by bacteria in pure culture
  • Lisa Hodges, undergraduate helper, 1997-1998, studied bacterial activities in Arctic samples (currently employed at CDC in Altanta)
  • JoHanna Brickle, undergraduate work study, 1997-1999, worked on bacterial abundance and culturability in sea ice
  • John Murray, undergraduate helper, summer undergraduate helper, 1994, worked on bacterial biovolume at low temperature

Former Undergraduate and High School Students

  • Brett Morris (UW AB program) Developed software for numerical reconstruction in digital holographic microscopy (source code: shampoo). (bmmorris AT