Career
He began fiddling at age six or eight. He received a Bachelor of Arts degree from Berea College in Kentucky in 2007, where his friends called him "Jack". He has had two internships: at the Smithsonian Institution with music archivist Jeff Place and with the West Virginia Humanities Council, working on the Mountain Music Heritage Project.
Krack performed on the A Prairie Home Companion radio program in 1998, and on the Mountain Stage radio program in 2000.
Also in 2000 he performed at the Millennium Stage of the John F. Kennedy Center for the Performing Arts. He performed at MerleFest in 2002 and in the 2003 Smithsonian Folklife Festival.
He compiled, arranged, and co-produced the 2007 Smithsonian Folkways Civil Defense Classic Old-time Fiddle From Smithsonian Folkways, and coproduced Lester McCumbers" Civil Defense Old Timey. He was featured in The New York Times in 1999 and appeared in the 2004 Public Broadcasting Service documentary Soundmix: Five Young Musicians.