Kermit the Frog said it best: it’s not easy being green. It wasn’t easy for Elphaba the witch of Wicked. It wasn’t easy for the Grinch (of stealing Christmas fame). And it certainly isn’t easy for Shrek, the good-hearted ogre from the swamp.

As difficult as it is for Shrek, that’s nothing compared to the challenges facing Eric Petersen (above), the actor playing him on tour in Shrek The Musical, which opens this week at the Orpheum Theatre as part of the SHN/Best of Broadway season.

The method of converting the amiable Petersen, who was the standby for Shrek on Broadway, into a singing ogre takes about 90 minutes. It takes a village, as they say, and the finished Shrek is the work of Tim Hatley (Tony Award-winning costume and set designer), Naomi Donne (make-up design) and Michael Marino (prosthetic make-up design).

“It’s not so bad,” Petersen says on the phone from Denver. “I can go to a Zen place while it’s being done. Sometimes I can even sleep through half of the process.”