For more than a decade he was a science journalist specializing in conservation issues for the Boston Globe and a contributor to Life, The New York Times, and Smithsonian Magazine.
The exhibition blends live musical performance with role-playing activities, and the largest collection of 13th century Mongolian artifacts ever toured.
Lessem's company Dino Don, Inc.[4] began constructing the world's most accurate full-sized robotic dinosaurs in 2017 for zoos and museums worldwide.
At the behest of Universal Studios, 1.3 million copies of a special edition of Dino Times were distributed at the opening of Jurassic Park.
Lessem is also the author of several humorous books including Aerphobics, Death by Roller Disco, How to Flatten Your Nose, and The Worst of Everything.
Lessem was the creator of Earth Quest Adventures, a theme park and resort planned for East Montgomery County, west of Houston, in 2008.
Lessem gained worldwide notoriety in 2019 for deploying his "Dumping Trump[7]" robot at anti-Trump protests in London and Washington DC.
On May 21, 2021, Lessem and his wife appeared on the Season 12 finale of Shark Tank to pitch their business Dino Don Inc.[8] They made a deal with Mark Cuban for a $500,000 investment in exchange for a 25% stake in the company.