university of north texas - department of biological sciences - institute of applied sciences


Jeff Johnson
Jeff A. Johnson

Assistant Professor

Dept. of Biological Sciences

Institute of Applied Sciences


Tel: 940.369.8071

jajohnson (AT)




Sarah Schulwitz

Graduate Student, PhD (start Spring '12)

Research focus: conservation genetics

Environmental Sciences


Tel: 940.565.4873

SarahSchulwitz (AT)



Broadly, I aim to contribute to the mitigation of our species’ negative impact on Earth’s biodiversity through education and applied research. My graduate research focuses on identifying factors that may influence avian population viability, specifically: pollution and habitat fragmentation. Initial research (for MS degree) quantified mercury levels in avian species at Arctic, Temperate and Sub-Antarctic latitudes to provide baseline environmental mercury values across differing trophic levels and proxomity to potential point sources. More recently, I am investigating population connectivity among Greater Sage Grouse (Centrocercus urophasianus) populations in Northwestern Wyoming using population genetic-based analyses. The results of this work will help to inform conservation and management decisions of Sage Grouse populations in Wyoming.
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Pradeep Khanal

Graduate Student, PhD (start Fall '15)

Research focus: conservation biology

Environmental Sciences


PradeepKhanal (AT)



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Marcy Harsaran

Graduate Student, MS (start Spring '15)

Research focus: avian population biology

Environmental Sciences



marcyharsaran (AT)


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Alex Stock

Graduate Student (start Fall '15)

Research focus: conservation genetics

Biological Sciences


AlexandraStock (AT)



Alex is working on Aplomado Falcon population genetics in collaboration with The Peregrine Fund.
Lab Alumni:  
Graduate students:  
Sarah Schulwitz Obtained MS May 2012. Continued her PhD studies at UNT Institute of Applied Sciences
Stephanie Galla Obtained MS May 2013. Currently a PhD student at University of Canterbury, Christchurch, New Zealand
Susan Hammerly Obtained PhD Aug 2014. Currently Assistant Professor in Biology at University of St. Joseph, Connecticut
Undergraduate students:  
Taylor Allison Undergraduate Researcher -- Graduated with BS May 2011 (now in Dental School)
Jaclyn Rosenwinkle Undergraduate Researcher -- Graduated with BS May 2011
Jessica Fowler Undergraduate Researcher -- Graduated with BS Dec 2010 (now at Arkansas State Univ with Dr. Virginie Rolland)
Nicole Harris Undergraduate Researcher -- Graduated with BS May 2010
Ryan Williams Undergraduate Researcher, McNair Scholar -- Graduated with BS May 2012
Jana Wold Undergraduate Researcher, HMMI Scholar -- Graduated with BS May 2012 (now at Victoria University of Wellington in New Zealand)
David De La Cerda Undergraduate Researcher, HMMI Scholar -- Graduated with BS August 2013 (now at Washington University)
Alysha Jaballa Undergraduate Researcher -- Graduated with BS in May 2015


last updated 03 Nov 2015