An IIM Ahmedabad graduate, Prerna gave up corporate career and became an environmental journalist. She worked at Sanctuary Asia magazine for a brief period. She joined mainstream media where she wrote about environment. 

Prerna has authored over 1,500 articles on nature and wildlife in mainstream media. She wrote King and I: Travels in Tigerland and edited an anthology on contemporary wildlife writings, Voices in the Wilderness.

Prerna has served on Uttarakhand’s State Board for Wildlife and was a member, National Board for Wildlife and part of its core Standing Committee between 2010-13.

She also edits Tigerlink, THE publication for up-to-date information on the tiger. She was designated an Ashoka Changemaker in 2011, has been awarded the International Visitor Leadership Programme and is a Chevening Gurukul Fellow.