Most recently, Roseman (pictured on the right, with Zynga’s CEO Mark Pincus on the left) oversaw last month’s launch of Zynga’s social games platform.

The platform, code-named “Project Z,” enables games to be played directly on Zynga.com, rather than through Facebook, making it an important strategy for the company as it seeks independence from the social network.

In addition, Roseman also served as the manager of the San Francisco-based company’s office in Seattle, where he helped to recruit engineers.

When reached by phone, Roseman briefly confirmed that he had left the company about three weeks ago, after the launch of the platform.

Roseman said one of the main reasons he was leaving was because he spent three to four days a week in San Francisco, and was looking forward to spending more time with his family in Seattle. He has not decided what to do next, but said he is looking forward to something entrepreneurial.

Before joining Zynga, Roseman was CEO of Evri, a semantic Web start-up funded by Paul Allen; before that, he was one of Amazon’s first engineers.

Zynga declined to comment on Roseman’s departure, but confirmed that Jim Veevaert is now managing the Seattle office. Previously, Veevaert was president of Jerry Bruckheimer Games, a games studio founded by the famous Hollywood producer; he also worked at Microsoft for more than seven years.

In January, Zynga told me it employed 50 people in Seattle and was hiring.

Since the Seattle office’s open house in April 2011, it has grown significantly.

To help attract talent over the past year, it acquired Gasworks Games and CupidsPlay, two Seattle-area companies. CupidsPlay developed a game that merged social games and online dating, which I’ve written about. The two acquisitions are fairly minor, and were primarily for talent.

According to LinkedIn, Gasworks Games’ co-founders Toby Gladwell and Andrew Kaplan have been working at Zynga for the past several months. Likewise, the co-founders of CupidsPlay Diwakar Gupta and CJ Huang have updated their profiles to reflect that they’ve been working at Zynga’s Seattle office for the past year.

Most recently, the Seattle game studio helped to launch Slingo on Facebook.

But–as many readers have requested–they will all be available in their entirety in this column.

In the less contentious spirit of DEMOfall and TechCrunch50, two demo conferences taking place simultaneously this week, we’re happy to bring you all the demos we had onstage at D6.

Next up is evri, the semantic Web guide start-up, which is backed by billionaire techie Paul Allen.

There are two videos showing the whole demo below.

In the first one, evri Founder Neil Roseman talks about the application that graphs the Web via grammatical information. He uses it to discover info about and people related to Sen. Barack Obama, for example, which is done in a “horizontal” manner. He somehow ends up at “Sex and the City” star Sarah Jessica Parker.

In the second, Roseman finds content about Walt Mossberg and me, as well as celebrity Rachael Ray, and talks about the business plan and inspiration for evri.

Day One

Bill Gates and Steve Ballmer, Microsoft

You would have loved Windows 1.0. Walt. You would have LOVED it.”

–Ballmer

Session post |  Videos: One and Two

Windows 7 Demo

Day Two

Jeff Bezos, Amazon.com

People loved their horses, too. But you don’t keep riding your horse to work just because you love it.”

–Bezos on the difference between physical books and digital ones

Session post |  Videos: One and Two

Bobby Kotick, Activision

The social element has really transformed the gaming experience.”

– Kotick on the impact of games like Guitar Hero

Session post |  Video

Guitar Hero IV Demo with Tony Hawk and Paula Abdul

Howard Stringer, Sony

If we were any more successful, we’d be bankrupt.”

–Stringer on the success of Sony’s LCD business

Session post |  Video

Barry Diller, IAC

Hollywood is a community that’s so inbred, it’s a wonder the children have any teeth.”

Session post |  Video

Michael Dell, Dell

I could take him.”

–Dell on his chances of success in a brawl with Apple CEO Steve Jobs

Session post |  Video

Jerry Yang and Sue Decker, Yahoo

I will never be a CEO again.”

–Yang

Session post |  Videos: One and Two

Jeff Bewkes, AOL

AOL is the Rodney Dangerfield of the Web. We don’t get no respect.”

Session post |  Video

Nathan Myhrvold, Intellectual Ventures

We invest in the creation of ideas… It’s like Baby Mama, with me as the mama.”

Session post |  Video

Demo: G.ho.st Web Operating System

Lets users access their desktop from any computer with an Internet connection.

Session post |  Video

Tom Glocer, Thomson Reuters

We have one great advantage over bloggers: we write once, and sell many times to many different media outlets.”

Session post |  Video

Mark Zuckerberg and Sheryl Sandberg, Facebook

I won’t ever stop until you’re either the biggest thing around, or you’re dead.”

–Kara Swisher on her relentless coverage of Facebook

Session post |  Videos: One and Two

Rupert Murdoch, News Corporation

I want to meet Obama. I want to know if he’s going to walk the walk.”

Session post |  Full Session Videos: One, Two, Three, Four, Five, Six

Day Three

Demo: evri

An application that graphs the Web via grammatical information.

Session post |  Video

Demo: 23andMe

Web-based, direct-to-consumer genome services.

Session post |  Video

Melinda Gates, Bill & Melinda Gates Foundation

All lives are equal.”

Session post |  Videos: One and Two

Demo: TransMedia’s Glide

A mobile-operating system that cuts across all operating systems.

Session post |  Video

Tom Rogers, TiVo

The TV set and its primary position in the home isn’t going anywhere in the future.”

Session post |  Videos: One and Two

Demo: Deka

The “Luke Arm” prosthesis, a state-of-the-art bionic arm.

Session post |  Video

Kevin Martin, FCC and Lowell McAdam, Verizon Wireless

You’re the chairman of the FCC. How did you allow this to happen?”

–Walt Mossberg grills Martin on the lousy broadband situation in the States

Session post |  Videos: One and Two

• Founder Roseman takes the stage. Compares evri to an army of grammar students graphing the Web. Is it search? asks Walt. Roseman says no. We’re about organizing content.

• The application graphs the Web via grammatical information. Searching on Obama. Page looks a bit like your typical social-network page. “What’s Obama doing?” (Celebrating his recent endorsement by Rupert Murdoch, perhaps?) Swapping in Sarah Jessica Parker for Obama to demonstrate the site’s video-categorization feature.
• Jumping from “Sex and the City” to new “Indiana Jones” movie via the application’s “most popular” tag.
• Pulling up Walt’s “canonical” page, Roseman points out that Walt’s graph is already linked up with Ballmer and Murdoch, presumably because of the events of the past few days.
• Roseman says evri is about “connecting people with the content they care about.”
• Kara asks how this is different from Mahalo. Roseman says Mahalo is driven by editors, evri is driven by an algorithm.
• Roseman says search needs a better user experience. The goal: to connect content to content the way social networks connect people.