Mohr Davidow Ventures (MDV Ventures) was founded in 1983 and is headquartered in Menlo Park. Within their Tech focus MDV is particularly interested in e.g. Data and Storage companies. The two managing partners are Bill Ericson and Jon Feiber.
Benchmark is a VC with a series of very successful investments including, among others, Yelp, Instagram and Zipcar. It was founded in 1995 by Jonathan Schulhof. Significant investments in the Big Data field include MySQL or Hortonworks. It is also based in Menlo Park.