Heather, known as Anish on trails, became the second female to complete the “Double Triple Crown of Backpacking” in 2017. This entails completing the Appalachian, Pacific Crest and Continental Divide National Scenic Trails each twice. In 2018 she simultaneously became the first female Triple Triple Crowner and the first female Calendar Year Triple Crowner when she hiked all three of those trails in one March-November season.

She also holds the overall self-supported Fastest Known Time (FKT) on the Pacific Crest Trail (2013)–hiking it in 60 days, 17 hours, 12 min, which broke the previous men's record by four days and established the first female record. She also holds the female self-supported FKT on the Appalachian Trail (2015) in a time of 54 days, 7 hours, 48 minutes, and the Arizona Trail (2016) which she completed in 19 days, 17 hours, 9 minutes.

She has hiked nearly 30,000 miles since 2003 including 13 thru-hikes:

Appalachian Trail in 2003, 2015, and 2018

Pacific Crest Trail in 2005, 2013, and 2018

Continental Divide Trail in 2006, 2017, and 2018

John Muir Trail in 2005

Wonderland Trail in 2010

Arizona Trail in 2016

Oregon Desert Trail in 2017

She is also an ultra-marathon runner and has completed six 100 mile races since August 2011 as well as dozens of 50k and 50 mile events. She has attempted the infamous Barkley Marathons four times, starting a third loop once. She is also an avid mountaineer and peakbagger working on several ascent lists in the US and abroad.

When not on an adventure Heather speaks regularly about her adventures and her first book is Thirst: 2600 Miles to Home (chronicling her Pacific Crest Trail record) published by the non-profit publisher Mountaineers Books.

National Geographic 2019 Adventurer of the Year

By age 25, Heather Anderson had hiked what is known as the "Triple Crown" of backpacking: the Appalachian Trail (AT), Pacific Crest Trail (PCT), and Continental Divide Trail (CDT)―a combined distance of 7,900 miles with a vertical gain of more than one million feet. A few years later, she left her job, her marriage, and a dissatisfied life and walked back into those mountains.

In her new memoir, Thirst: 2600 Miles to Home, Heather, whose trail name is "Anish," conveys not only her athleticism and wilderness adventures, but also shares her distinct message of courage--her willingness to turn away from the predictability of a more traditional life in an effort to seek out what most fulfills her. Amid the rigors of the trail--pain, fear, loneliness, and dangers--she discovers the greater rewards of community and of self, conquering her doubts and building confidence. Ultimately, she realizes that records are merely a catalyst, giving her purpose, focus, and a goal to strive toward.

Heather is the second woman to complete the “Double Triple Crown of Backpacking,” completing the Appalachian, Pacific Crest, and Continental Divide National Scenic Trails twice each. She holds overall self-supported Fastest Known Times (FKTs) on the Pacific Crest Trail (2013)―hiking it in 60 days, 17 hours, 12 minutes, breaking the previous men’s record by four days and becoming the first women to hold the overall record―and the Arizona Trail (2016), which she completed in 19 days, 17 hours, 9 minutes. She also holds the women’s self-supported FKT on the Appalachian Trail (2015) with a time of 54 days, 7 hours, 48 minutes. Heather has hiked more than twenty thousand miles since 2003, including ten thru-hikes. An ultramarathon runner, she has completed six 100-mile races since August 2011 as well as dozens of 50 km and 50-mile events. She has attempted the infamous Barkley Marathons four times, starting a third loop once. Heather is also an avid mountaineer working on several ascent lists in the US and abroad.