Mr D (Mark R Deffebach) explored several musical instruments in the family growing up in South Oakcliff and Duncanville, but no one played them. Mr D studied piano privately (5th grade) and clarinet at school(6th grade).  He taught himself guitar around 7th grade.  At 16 he paid for a summer of guitar lessons and played in the Duncancille jazz band his Senior year. Graduating from Cedar Valley College with AAS in Guitar, he tranfered to UTA as a music major, but dropped out to join the Army to pay for a wife and kid on the way.  From age 16 until the army there were several garage bands. After the army Mr D graduated from UTA with a BSEE and entered the corporate world. But after 10 years designing digital, mixed signal and preamps for Peavey Electronic, Mr D took a vow of poverty in 2008 to try his hand as a full time musician. While working as an engineer, Mr D started playing guitar in various bands and learned the upright bass well enough to play swing and jazz. He also frequented several song circles, open jams and drum circles where he grew his music network. Mr D currently plays gypsy jazz, swing guitar, and slap upright bass in several DFW based bands, and some how still manages to pay his mortgage.