Airsoft (Acquired by Shiva in 1996), Allayer Communications (Acquired by Broadcom in 2000), Argon Networks (Acquired by Siemens in 1999), Ascend Communications (IPO 1994, Acquired by Lucent in 1999), Copper Mountain Networks (IPO 1999), CrossComm Corporation (IPO 1993, Acquired by Olicom in 1997), Edify Corporation (IPO 1996), Enuvis (Acquired by SiRF in 2003), HNC Software (IPO 1995), Ikanos Communications (IPO 2005), IntelliLink (Acquired by Puma in 1996), Inverse Network Technology (Acquired by Visual Networks in 1999), Ipsilon Networks (Acquired by Nokia in 1997), Maker Communications (Acquired by Conexant in 2000), NetScout (IPO 1999), Phone.com (IPO 1999, Merged with Software.com in 2000), PrairieComm (Acquired by Freescale in 2005), Puma Technology (IPO 1996), RightNow Technologies (IPO 2004, Acquired by Oracle in 2012), Sahara Networks (Acquired by Cascade in 1997), SiTime (Acquired by MegaChips in 2014), Sonix Communications (Acquired by 3Com in 1995), Starburst Communications (Acquired by Adero in 2000), Syndesis (Acquired by Subex Azure in 2007), Whitetree Network Technologies (Acquired by Ascend in 1997), Xedia (Acquired by Lucent in 1999), Xircom (IPO 1992, Acquired by Intel in 2001), Zeitnet Data Systems (Acquired by Cabletron in 1996)
Roger came to Greylock after a successful career as the CEO of Micom Systems, a Greylock-sponsored company he and a partner started in 1976.
Roger is on the board of Picarro and Silver Peak Systems. He also served on the board of and led Greylock's investment in companies such as Ascend (acquired by Lucent), Argon Networks (acquired by Siemens), Crosscomm (acquired by Olicom), Maker Communications (acquired by Conexant), Openwave, RightNow Technologies, Sahara Networks (acquired by Cascade), Sirocco Systems (acquired by Sycamore), Syndesis (acquired by Subex Azure), Whitetree (acquired by Ascend), Xircom (acquired by Intel), and Zeitnet (acquired by Cabletron).
He is a graduate of Cambridge University.