Medidata Solutions To Shape eClinical Trial Discussion at Bio-IT World Conference + Expo

May 16, 2005

Applied Clinical Trials

Glen de Vries, Medidata Co-Founder and Chief Technology Officer, to Deliver Expertise and Innovations in Electronic Data Capture and Management Solutions

NEW YORK, May 16 - Medidata Solutions, a global electronic clinical data capture and management solutions provider with clients in 40 countries, today announced that CTO and Co-Founder Glen de Vries will be participating in two seminars during the upcoming Bio-IT World Conference + Expo, to be held May 17-19, 2005 at the Hynes Convention Center in Boston.

During the show's "eClinical Vendor Panel Discussion (e23)," to be held Wednesday, May 18th from 1:00 to 2:30 p.m., Mr. de Vries will present his views on current and projected market conditions, challenges and opportunities in the eClinical Technology arena. He will also offer his industry insight based on several of Medidata's recent global customer implementations of RAVE 5.0, the industry's first unified platform for electronic clinical data capture and management.

Mr. De Vries will later participate in a session of the show's day-long Venture Forum, "A Buyer's Panel: A Frank Discussion," which will take place from 3:15 to 4:00 p.m. on Thursday, May 19th. During this panel, he will outline the critical components involved in making electronic clinical and management buying decisions with the highest ROI. Consisting of a cross- section of senior-level end-users at organizations across the life science and healthcare space, this panel will be valuable to investors and young biotech and biopharma companies alike.

Glen de Vries has filled the role of Chief Technology Officer since co- founding Medidata Solutions in 1999. As the lead architect for all of the company's product offerings, he was responsible for developing Medidata's flagship electronic clinical data capture and management solution, RAVE 5.0. Prior to his work with Medidata, Mr. De Vries' pioneering efforts in online physician/patient relationships were featured by The New York Times and drew the attention of the Office of Health and Human Services. His undergraduate degree is in molecular biology and genetics from Carnegie Mellon University. His subsequent work at Columbia University focused on both research science and medical informatics, working on a blood assay for the detection of micro- metastases in prostate cancer patients, and creating a paperless clinical data management system.

About Bio-IT World Conference + Expo
Bio-IT World Conference + Expo is the leading event to demonstrate how technology is transforming the life sciences throughout all discovery and development processes. Bio-IT World Conference + Expo is designed for life science professionals looking to evaluate and understand advanced solutions that generate, collect and analyze the flood of information being produced by the life sciences industry. Visionaries from the biotechnology, pharmaceutical, healthcare, academic and government markets convene at Bio-IT World Conference + Expo to learn how the latest tools, services and best practices will help revolutionize our health, our environment and our society. For more information, visit www.bio-itworldexpo.com.

About Medidata Solutions
Medidata Solutions understands and helps customers capture and manage clinical data better than any one else. By reducing the latency of information flow and optimizing data capture for decision-making with enterprise-class workflow and web-based products, Medidata Solutions assists global life sciences and research organizations to accelerate the process of bringing life-enhancing treatments to market. Medidata Solutions' flexible applications streamline the collection, verification, consolidation and analysis of clinical research data. This gives front-line clinical investigators and data managers the earliest possible visibility into data for more precise decision- making, reduced costs and better answers. To learn more about Medidata Solutions visit www.mdsol.com.