David Kalt is the founder of Reverb.com, the online marketplace for guitars, gear and musical instruments, and the owner of the Chicago Music Exchange, one of the world’s best-known vintage guitar dealers. A technologist and serial entrepreneur, Mr. Kalt was the technical co-founder and CEO of online broker optionsXpress, which launched in 2000. OptionsXpress went public in 2005 and was later acquired by Schwab for $1 billion. His first startup, ClientBase, was the leading CRM solution for travel agents and tour operators, and is now part of Sabre Travel Network.