Eliot Ramsay Kalmbach, 24, of Downingtown, a Princeton University senior and outdoor enthusiast, died Tuesday in a fall while hiking Teewinot Mountain in Grand Teton National Park in Wyoming.

Mr. Kalmbach was an experienced mountaineer and climbed Mount Kilimanjaro two summers ago. He was very safety-conscious, said his father, John.

A geoscience major at Princeton, Mr. Kalmbach took off the spring semester of his sophomore year to intern at the Lee Institute for Japanese Art in Hanford, Calif., and to participate in an archaeology dig in Syria. In the fall of that year, he attended the National Outdoor Leadership School in Patagonia, Chile, before returning to Princeton.

He took off the spring semester this year to work on a start-up venture. He and other students were developing software that would allow high school students to prepare for SATs by using their iPhones. Over the summer, he studied volcanoes in Russia.

Mr. Kalmbach was in Wyoming on his way to Washington state, where he was going to be an intern at Intellectual Ventures in Bellevue. He planned to work all week and hike in the Northwest on weekends before returning to Princeton in January for his final semester, his father said.

Mr. Kalmbach graduated from Downingtown West High School in 2004. An Eagle Scout with Hopewell Troop 8, he spent a summer as a ranger at Philmont Scout Ranch, the Boy Scouts' high-adventure camp in New Mexico. Since he was 8 or 9, his father said, he had hunted hares with the Skycastle French Hounds in Chester Springs.

In addition to his father, Mr. Kalmbach is survived by his mother, Cecilia; sisters Whitney Moore and Hilary; and grandmother Elizabeth.

The funeral will be at 10 a.m. Monday at St. Andrew's Episcopal Church, 7 St. Andrew's Lane, Glenmoore. Friends may call from 9 a.m.