Thank you, Nick and good afternoon, everyone. Welcome to our Q3 '17 earnings call. When I arrived March, I focused a team on accelerating our efforts on header bidding at the time it was the greatest and most immediate opportunity that we had to win back market share. And today, I'm happy to say that the team has made significant progress against this objective in just six short months. The amount of inventory that we have access to has grown by 50% year-over-year. According to a recent report issued by Rockford, within Prebid open source client-side header bidding implementations, we are now one of the top two revenue sources for desktop inventory being sold through these implementations and a mobile ad spend, we were neck and neck with Facebook's audience network as the leader. And with the launch of our open-source server-side header bidding solution, we expect to further grow our market share and strategic position within header bidding as sellers move towards the use of open-source server-side solutions to meet their monetization needs in a rapidly evolving market. Now that we are no longer playing catch-up in header bidding, we are shifting our efforts to focus on differentiating our platform. In alignment with our strategy, which I outlined on the earnings call last quarter, I see four areas of differentiation. First, cost. We are committed to becoming the low-cost provider. Second, transparency and choice, clear, fair and transparent auction dynamics that support multiple versions of header bidding implementation. Third, the programmatic supermarket, if it can be bought or sold programmatically, you can find it on the Rubicon project exchange and fourth, inventory quality and brand safety, which have always been key differentiators for our exchange and an area that we plan to continue to leverage. Let's start with cost. Earlier this year, we proactively made cuts to our pricing that lowered our total take rate from 24% in Q4 2016 to what's now just under 17% at the end of Q3. We did this to be more competitive and have improvements to our win rates from these changes. However, to win a greater share of that spend from buyers and to provide the transparency they want, we simplified our pricing model and completely eliminated our buyer fees across our platform as of November 1. This means that buyers will find simplicity and clarity working with us and their budgets will now go further in reaching the audiences that are most important to them. As evidenced through direct feedback and public commentary, buyers want more transparency into where their dollars are being spent and where their ads are appearing. They no longer want or need to work with dozens and sometimes more than 100 different exchanges to reach the audiences that they want. Buyers want to consolidate their spend on the platforms that deliver the best results and we believe that Rubicon project is strategically positioned to capitalize on this new trend due to the elimination of our buyer fees. The elimination of our buyer fees drives lower overall take rates than we first envisioned resulting in greater near-term operating losses, but it's the absolute right action to position us for the future. In fact, we are already receiving positive feedback from key buyers on our exchange, including Medium Mass who told us that they support our decision to enact a simpler, more transparent fee structure as it furthers enables their clients to efficiently purchase impressions and audiences that are the most valuable to them, while gaining greater visibility into the supply chain. The heart of transparency at Rubicon project is delivering a clean, fair, efficient and transparent marketplace so our clients can optimize their businesses to achieve the best results. Rubicon project has traditionally only offered a modified second price auction within its open and private marketplaces. However, since the introduction of header bidding, there’ve been a variety of auction dynamics being used by different exchanges and supply-side platforms, which directly impacted the ability of buyers to win valuable impressions as their bidding strategies were optimized for only second price auctions. As an exchange, our goals to facilitate the transaction of inventory at a price that is competitive for our sellers, but still aligned with the value it we will deliver to our buyers. To that end, we've been assessing the impact of auction dynamics in our marketplaces. In the third quarter, working closely with our demand and supply partners, we initiated more comprehensive testing that examines the effects of modified first and modified second price auction dynamics in our current environment. This testing was initiated on all header bidding traffic on our exchange in early September. We confirmed that the change of dynamics paired with lower marketplace fees and in some cases, no buyer fee resulted in better results for both our buyers and sellers. For instance, the amount of revenue that a seller achieves through our header bidding solution has increased steadily since the initiation of testing and we've also seen a positive upward trend in the win rates for our buyers as well as an increase in ad spend. These results were achieved before the deployment of nToggle's technology across all of our U.S. buyers. However, upon the integration completion, which remains on track for Q4 2017, we expect to see even better results related to buyer win rates, publisher revenue and ad spend increases in the future. We will share more around the results of auction dynamics tests as we have them. Now that I've discussed the steps we're taking to become the lowest cost and most transparent platform buyers and sellers, I'd like to shift focus and discuss the progress that has been made in becoming a high-volume global ad exchange. We've achieved great progress towards our goal of being the supermarket of programmatic inventory. If it can be bought or sold programmatically, you can find it on the Rubicon project exchange. Today buyers have been on every type of ad inventory including desktop, mobile web, mobile in app, audio, video, digital out of home and more and sellers can reach the premium brands and advertisers that they want associated with their sites and applications. By continuing to grow the amount and variety of inventory types on our platform, we believe that over time buyers will migrate off of specialized smaller platforms and increasingly conduct business with scaled one-stop platforms like ours. This quarter mobile ad requests have increased by 95% year-over-year and mobile now accounts for nearly half of our ad spend. One of the largest areas of growth within mobile and mobile app specifically is audio. We've seen a 3X increase in ad requests for audio, one of the emerging media channels that we've been investing in. This growth is due to the increasing global user base of streaming audio platforms like Spotify. Our video business continues to outpace market growth with ad spend up 73% year-over-year as compared to 26% year-over-year growth for the industry according to a recent Nielsen report with video ad requests growing more than 60% year-over-year in Q3. And today I'm happy to announce that there are more than 20,000 buyers accessing video inventory through the Rubicon project exchange. And last but not least there is orders, we've seen continued growth in orders with the most meaningful contribution coming from private marketplaces also known as PMPs. We've seen increasing demand from leading global agencies and holding companies that are looking to reach their key target audiences in a brand-safe environment and our PMP technology enables them to strike deals for specific inventory and audiences directly with publishers and app developers. We've also made strides to make access to these private marketplace packages as easy and accessible to buyers as possible through new partnerships with leading DSPs. Most recently we signed a partnership agreement with Google to make our PMP packages available to buyers through the DoubleClick Bid Manager marketplace, the first partnership of its kind for Google's DBM marketplace. Partnerships like this offer a unique value for our sellers as it makes their inventory packages available to more buyers. The last key differentiator that I'd like to discuss is one that as I previously noted has been a unique selling point for Rubicon project for a very long time; inventory quality and brand safety. This was an area that was invested in during the early days of Rubicon project and we remain vigilant and constantly evolving our processes and technology for identifying and blocking both bad ads and bad actors from entering our exchange. Our process is unique as it requires human oversight in addition to cutting edge technology. This is an area that we intend to focus on in order to deliver a best-in-class experience and results for both our buyers and sellers. The investments that we've made in this area position us well for new industry initiatives such as ads.txt. There's been a lot of change in the industry however, nothing has changed in terms of Rubicon project strength of offering and strategic position. As with any exchange, our growth is linked to our ability to drive positive network effects. By powering an exchange that is as efficient and cost-effective as possible for buyers and sellers, we are able to better -- we're better able to capitalize on positive network effects and further increase our market share. We strongly believe that we can and will win in the new ecosystem and in the long run if we match our superior tech offering and client service with the right pricing for the market. With that, I will hand the call over to David to give more detail on our financial performance in Q3 2017.