A profile of Zach Frankel, a secretive and unusually hands-on solo investor who wrote the first checks to startups like Ramp, Cognition, and Applied Compute (Jemima McEvoy/The Information)

Jemima McEvoy / The Information: A profile of Zach Frankel, a secretive and unusually hands-on solo investor who wrote the first checks to startups like Ramp, Cognition, and Applied Compute — Last month, Zach Dell, son of billionaire Michael Dell and cofounder of Base Power, a billion-dollar…