[2] His first six years in the United States were spent in Los Angeles where he recorded, performed live or appeared on TV with Robbie Robertson, Gene Clarke, Sparks, John Waite, Billy Idol, members of the Red Hot Chili Peppers, Victoria Williams and others.
He appeared on American Bandstand, Solid Gold, and on MTV with various artists and worked as a musician with notable producers, including T Bone Burnett, Anton Fier, Daniel Lanois, Thomas Barquee, Ben Leinbach and Shimshai.
Christian also did technical work (producer, engineer, mastering) for artists such as Jai Uttal, Ancient Future, Habib Khan, Silvia Nakkach, Dave Stringer, Girish, Snatam Kaur, Spring Groove, GuruGanesha Band and many others.
He also continues to collaborate with national chant artists, including Johanna Beekmann, Kavita Kat MacMillan, Jim Gelcer, Dave Stringer, Ragani, Kaita Bliffert, and others.
In 2021, Hans started to produce a series of songs to be used as fundraising tools for a variety of non-profit organizations, often working with Door County–based singer/songwriter Holly Olm.