Working on both sides of the border, Ben developed a friendship with Mexican environmentalist and poet, Homero Aridjis, the who lobbied for more than a decade to protect the Monarch's winter home, establishing Monarch Butterfly Biosphere Reserve as a UNESCO World Heritage Site in Michoacán.
In 2019, Penguin Random House published Ben's book, Senorita Mariposa, which chronicles the monarch butterfly migration. As part of the book release, Ben made a pilgrimage to the mountains of Michoacán, where he witnessed millions of butterflies congregating in their winter home, and met with Homero at his home in Mexico City.