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 Assistant Professor  has been named a by the . Regarded as one of the most competitive and prestigious awards available to early-career scholars, the Fellowship recognizes researchers “whose creativity, innovation, and research accomplishments make them stand out as the next generation of leaders.”

“The Sloan Research Fellows are among the most promising early-career researchers in the U.S. and Canada, already driving meaningful progress in their respective disciplines,” , president and chief executive officer of the Alfred P. Sloan Foundation. “We look forward to seeing how these exceptional scholars continue to unlock new scientific advancements, redefine their fields, and foster the wellbeing and knowledge of all.”

"This is a wonderful and welcome surprise that will support my ongoing research on mountains across the globe,” says Freeman. “It's a vote of confidence and will let me get out there and get to work."

Freeman is one of 126 scientists selected this year for the honor and will receive a two-year $75,000 grant of flexible funding to support his research.

He joins the ranks of nearly 50 faculty from �鶹�� Tech who have received Sloan Research Fellowships, including School of Mathematics’ Alex Blumenthal in 2024, Hannah Choi in 2022, Yao Yao in 2020, Konstantin Tikhomirov in 2019, Lutz Warnke in 2018, Zaher Hani in 2016, Jen Hom in 2015, and Greg Blekherman in 2012; School of Chemistry and Biochemistry's Vinayak Agarwal in 2018; School of Earth and Atmospheric Sciences' Christopher Reinhard in 2015; and School of Physics’ Chunhui (Rita) Du in 2024 and Tamara Bogdanović in 2013. 

Freeman joined the Institute in 2023 and was also recently named a  by the David and Lucile Packard Foundation and  by the Ecological Society of America.

Understanding the ‘escalator to extinction’

Known for his groundbreaking research in climate change and bird ecology, Freeman studies birds worldwide from Appalachia to Ecuador. He specializes in tropical populations where his work is centered on understanding how mountain species respond to a changing climate — and how to facilitate their survival. 

“Tropical mountains are some of Earth’s largest biodiversity hotspots; they harbor an extraordinary number of species,” shares Freeman. “Additionally, tropical mountain birds are particularly sensitive to environmental change, so they can serve as an early warning system for global conservation efforts.”

Previously, his research has shown that some species are on an ‘escalator to extinction’ with vulnerable groups moving to higher elevations to escape warming temperatures. At the top of the escalator, some summit-dwelling species are disappearing. 

“We know that many species are on this escalator,” Freeman says. “The next step is to figure out which species are most vulnerable and why. In order to direct conservation efforts, we need to know who is vulnerable, why small increases in temperature have dramatic effects, and what can be done to help.”

A worldwide early warning system

To uncover those answers, Freeman is taking two approaches: mapping global patterns with big picture data and conducting on-the-ground research in the tropics.

To target the former, he created the , which supports community scientists in conducting bird surveys on their local mountains. The goal is to create a system that allows researchers to diagnose vulnerable species before they are too sparse to save.

“When a species is in trouble, we need to know as soon as possible,” Freeman says. “Once a population is small enough to be at risk of extinction, it’s very hard to reverse that process. The Mountain Bird Network collects data on mountain bird abundances and distributions across the globe, which, when used with data from a global citizen science program called eBird, can be leveraged to build models to identify which species might be vulnerable before those populations become critically small.”

A living lab on Tech Mountain

Freeman’s other avenue of research involves building an ambitious living laboratory in Pinchincha, Ecuador. The research site will span thousands of meters along the flanks of a local mountain, spanning lowland rainforest, foothill rainforest, and cloud forest ecosystems.

“The mountain is home to thousands of birds from hundreds of species,” Freeman says. “My goal is to track and understand their daily lives — and how climate changes impact them.”

Using cutting-edge tracking technology, he will tag and monitor their daily movements, mapping those against microclimate sensors placed at different elevations along the mountain’s slopes. The challenge of placing and maintaining thousands of tiny sensors in rugged conditions means that it has never been done before.

“We’ll track these birds for at least five years –- but hopefully for decades,” Freeman says. “The data we gather at Tech Mountain will be the first of its kind, and my hope is that it makes a real difference in conservation efforts worldwide.”