Lightspeed has added six new hires including Jana Messerschmidt, Twitter's former head of business development.Credit: Lance Skundrich Months after raising $1.8 billion in fresh funds, one of Silicon Valley’s faster-growing venture firms has made a wave of hires to continue its growth. Lightspeed Venture Partners announced Thursday it had hired six new staff, including five investment partners that include the former head of business development for Twitter and head of growth for Slack.