Mark Hartenberger is the owner of Black Sheep Tattoo and has been tattooing for over 30 years, he has resided and tattooed in Florida, Colorado, Kansas, and Oklahoma. He travels throughout the United States working at tattoo conventions and has been a guest artist at shops in the US, Utrecht and Amsterdam. He is eager to take on challenging ideas and can emulate many styles of tattooing, but his favorite is freehand because it is the most organic and unique.