What artist that co-founded a band with David Knopfler also played with the group Brewers Droop?
Brewers Droop:  Though they did not chart, they are notable as an early exponent of the pub rock style, as well as for their connections with Dire Straits, as both Mark Knopfler and Pick Withers played with the group for a few months in 1973. Mark Knopfler: Mark Freuder Knopfler, {'1': ", '2': ", '3': ", '4': "} (born 12 August 1949) is a British singer-songwriter, guitarist, record producer and film score composer. Mark Knopfler:  He is best known for having been the lead guitarist, lead singer and songwriter for the rock band Dire Straits, which he co-founded with his younger brother, David Knopfler, in 1977.
Mark Freuder Knopfler