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Ben Horowitz joined Lyft’s board of directors

The company announced the a16z co-founder joined the company’s six-person board on Monday just weeks after Lyft hit one million new passengers.

Tech:Crunch Disrupt SF 2012 C Flanigan / Getty Images

A16z co-founder Ben Horowitz has joined Lyft’s board of directors, the company formally announced in a blog post today. Bloomberg first reported Horowitz’ position on the board in September.

Horowitz had joined the board in August, according to the company.

The venture firm led a $60 million series C round in the ride-hail company in May 2013 at a time when Lyft performed 120,000 rides a month. According to the company, Lyft now performs 17 million monthly rides and saw one million new riders join the platform just in October.

Horowitz is replacing a16z partner Scott Weiss who quietly stepped down from the board in August months after announcing he was curbing his day-to-day investment activity.

Horowitz joined a six-person board that includes Lyft co-founders Logan Green and John Zimmer; General Motors President Dan Ammann; Rakuten's Hiroshi Mikitani; Icahn Capital’s Jonathan Christodoro; former Trulia CFO Sean Aggarwal; and Floodgate Fund’s Ann Miura-Ko.

The company officially announced Horowitz’s addition to the board just weeks after enduring a bit of an executive shuffle. Lyft’s CMO Kira Wampler and Vice President of Communications Brandon McCormick announced their departures just as two new executives came on board. Raj Kapoor, who was previously at Mayfield Fund (which participated in Lyft’s series A round), was hired as the chief strategy officer, and Melissa Waters, formerly of Pandora, joined as the head of marketing.

Though internal documents show the company is growing, Lyft is under increased pressure to catch up with ride-hail behemoth Uber, which has logged 40 million monthly active users and is now valued at $68 billion.

Update: This story has been updated to reflect that Horowitz has been on the board since August.

This article originally appeared on Recode.net.