Meet the Club Members

Doan Goolsby
Tierra Seca President
Doan is a fourth-year undergraduate pursuing a degree in Rangeland Management. He is researching the use of machine learning models to predict the spread of Cenchrus ciliaris (Buffelgrass) and Oncosiphon piluliferum (Stinknet) in southern Arizona. He works in the Social Ecological Systems Lab with Dr. Aaron Lien and the Trait-Based Functional Ecology Lab with Dr. Rachel Mitchell.
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Casandra Harris
Tierra Seca Vice President
Casandra Bio (soon to come)

Oskae Anderson
Tierra Seca Treasurer
Oskar is a UofA senior studying Rangeland Management. A Tucson native and aspiring natural historian, he is grateful for the connections to both social and ecological communities that Tierra Seca provides to students. Oskar currently works to study wildlife movement corridors with the Sky Island Alliance and spent the summer of 2025 recording data on Eastern Wyoming plant communities with TBGPEA.
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Philly Montierth
Tierra Seca Secratary
Philly Bio (soon to come)
Club Advisor

Dr. Aaron Lien
Dr. Aaron Lien is an Assistant Professor of Rangeland Ecology and Adaptive Management at the University of Arizona. His research addresses challenges in Social Ecological Systems (SESs) and integrates human behavior theories and governance frameworks, alongside interdisciplinary expertise in climate science and rangeland management.
Recent Graduates

Brandi Obergon
Graduated Fall 2024

Seth Duncan
Graduated Spring 2025

Maddie Terlap
Graduated Spring 2025

Dakota Baden
Graduated Spring 2025

Brian Muha
Graduated Spring 2025