Hello! I'm a PhD student in the UC Santa Cruz Department of Earth and Planetary Sciences. My research explores the evolution and ecology of marine mammals. I am using stable isotope analogues to understand how whales and seals adapted to changing ocean environments over the past 50 million years. I'm specifically exploring calcium (Ca) as a trophic proxy. 

I'm passionate about broadening participation in Earth science by developing high-quality resources for K-12 educators. You can find free lesson plans, worksheets, and training resources on my website. 

Please don't hesitate to contact me with any questions or opportunities for collaboration!  tholzman@ucsc.edu