How legendary venture firm Insight Partners hires—and trains—its next generation of investors to expand its $90 billion warchest

In early April, Insight Partners’ cofounder and managing director Jeff Horing took the stage at his firm’s sourcing summit, a one-day annual event where Insight gathers its early-career analysts to train them on the firm’s secret formula for success. 

Horing is one of the more elusive figures in venture capital, keeping a low profile even as Insight has imprinted a $90 billion, multi-decade footprint on software investing. He was at ease, though, as he surveyed the 75-odd-person crowd of future investors...