Rosenblatt was born in Woodland Hills, CA on 6 April 1969. He is Jewish, and was raised in Southern California by his physicist father Martin and Health Sciences Professor mother Jane. Rosenblatt went on to earn a B.A. from UCLA, and a J.D. from University of Southern California Law School (class of 1994). After getting his law degree, Rosenblatt took a job at Brobeck, Phleger & Harrison, in Los Angeles, but quit after 6 months citing boredom.
In October 1994, Rosenblatt co-founded iMALL and served as head of internet media and web development. iMALL's products included a suite of tools to build e-commerce stores and transact commerce over the internet. Rosenblatt replaced one of the founders, Craig Pickering, as CEO in July 1996 and took on the additional role of Chairman of the Board in January 1997. Rosenblatt oversaw a restructuring and rebuilding of the business. In 1998, iMALL partnered up with First Data Merchant Services (FDMS) in a deal that provided access to roughly 2 million merchants and included a $14 million equity stake in iMALL. In April 1999, Verio, Inc. teamed up with iMALL and First Data to create VerioStore, a product selling e-commerce services. Later that same year, IBM bought iMALL and First Data’s technology for their e-commerce services. In July 1999, Rosenblatt negotiated the sale of iMALL to Excite@Home for $565 million. In 1999, iMALL and two of its founders were sued by the Federal Trade Commission, though Rosenblatt was not among those named in the suit. Rosenblatt became the Sr. VP of e-commerce for Excite@Home for a short period of time.
Following iMALL’s sale, Rosenblatt became the founding investor and vice chairman of Great Domains. The company became a leader in the secondary domain market and was acquired by VeriSign, Inc. in October 2000 for $100 million.
In August 2000, Rosenblatt became the interim CEO of the ailing DrKoop.com. His participation was part of a larger effort by investors to reconfigure the business into a hybrid online and offline venture that was structured to be less dependent on the erratic flow of advertising dollars. The turn-around was nearly complete when the Internet market collapsed and 9/11 occurred, causing the company to file for bankruptcy in December 2001.
In February 2004, Rosenblatt became CEO of Intermix Media (formerly eUniverse, Inc.) where he led the growth of Myspace.com from an unknown web site to one of the most popular properties on the Internet. In 2005, Intermix was sold to News Corporation for $649 million, $580 million of which was cash, with an additional $69 million being paid to private shareholders. In 2005, former New York Attorney General Eliot Spitzer filed suit against Intermix. Rosenblatt was not among those named in the suit. Spitzer accused the company of installing advertising software without notifying unsuspecting consumers. Intermix acknowledged this was part of an outdated practice put in place by previous leadership, but insisted the company no longer installed software without first notifying a customer they were doing so. The case against Intermix was later settled for a monetary sum, though there was no admission of guilt. The founder and former CEO of Intermix Media Inc., Brad Greenspan, was fined $750,000 as part of an agreement with Spitzer to end the investigation against him. In 2006, Greenspan filed suit against Intermix, claiming the executives and directors, Rosenblatt among them, withheld key information to shareholders regarding the potential revenue generated by the sale of Intermix to News Corp. Greenspan specifically said the sale cheated shareholders by not including the growth potential of MySpace.com in the agreed upon sales figure. Critics pointed out that at the time of the sale News Corp’s purchase of Intermix was still considered a financially risky proposition. Further damaging his claims was the fact that Greenspan was asked to step down as CEO when the company had been under investigation by the SEC and the shares had dropped to an embarrassing low. The case was dismissed on Friday, 6 October 2006, when Judge Carolyn Kuhl determined that shareholders of Intermix Media, Inc. had been lawfully informed prior to voting on the transaction. On 1 August 2008, a judge ordered one count in the class action shareholder suit brought against the Intermix executives could go forward. The case is still pending.
Rosenblatt then co-founded Demand Media with private-equity executive, Shawn Colo. The company launched in May 2006 with $120 million in equity, and announced the acquisitions of eNom, Inc. and eHow.com. By March 2008, Demand Media raised the total amount of equity to $355 million. Demand Media owns many websites, including eHow and Golflink.com. In January 2008, Demand Media partnered with Lance Armstrong and his Foundation (LAF) to build out the daily health, lifestyle and fitness destination, LIVESTRONG.com. 
In addition to his internet ventures, Rosenblatt is the co-owner of several Southern California nightclubs named Air Conditioned. The first was established in 2002 in San Diego, while the other two are located in Venice and Santa Monica.
Rosenblatt is a co-lecturer with Peter Guber under UCLA’s MBA program for the course, "New Media: The Convergence of the Poet and the Engineer.”  He was also recently named the USC Entrepreneur of the Year 2008.
Rosenblatt is a Gold Circle Member of the City of Hope Helford Clinical Research Hospital, a National Cancer Institute-designated Comprehensive Cancer Center. He is also active with the Lance Armstrong Foundation, LIVESTRONG.
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