Jeffrey M. Rosenfeld
Partner
Jeff is an experienced litigator who focuses on speech, advertising, and intellectual property disputes on the Internet.
Phone Number
949-374-5036 Ext. 112
415-955-1155 Ext. 112
Email Address

Jeffrey M. Rosenfeld
Partner
Jeff is an experienced litigator who focuses on speech, advertising, and intellectual property disputes on the Internet.
Phone Number
949-374-5036 Ext. 112
Email Address
Jeff represents clients in intellectual property litigation and internet-related litigation, handling the wide variety of legal issues that arise in connection with the Internet.
Jeff also regularly defends consumer class actions alleging unfair competition and false advertising regarding websites, emails, and e-commerce platforms. In particular, Jeff’s practice focuses on the following types of cases:
- Copyright and Trademark Infringement: Jeff regularly represents both defendants and plaintiffs in copyright and trademark infringement lawsuits involving website content, digital products, and online advertisements.
- Online Defamation: Jeff has extensive experience representing both plaintiffs and defendants in defamation cases involving online content, including anonymously-published content. Jeff has litigated all aspects of online defamation matters from anti-SLAPP through trial, and he has worked with clients and experts to quantify both economic and non-economic damages in such cases.
- False Advertising on the Internet: Jeff’s clients are primarily online retailers of everyday products and services, such as dietary supplements, office supplies, recreational products, home electronics, and car rental services. Jeff represents these clients when their competitors make false statements in advertisements, or when Jeff’s clients are accused of making false statements about their own products and services.
- Spam, TCPA, and Telemarketing Defense: Jeff devotes a significant portion of his practice to defending spam, TCPA, and telemarketing litigation, and he has been involved in several precedent-setting cases. Jeff is well-versed in all aspects of the relevant spam and TCPA authority as well as the practical trial and settlement dynamics of spam and TCPA litigation.
We use a practical approach to all of our litigation. We take into consideration our client’s goals, all of the possible outcomes, and the realistic cost of the litigation in order to develop a vigorous strategy to achieve our client’s goals.
Prior to joining Kronenberger Rosenfeld, Jeff was a litigation associate with Howard Rice Nemerovski Canady Falk & Rabkin in San Francisco, and before that, a litigation and data privacy associate with Covington & Burling in Washington, D.C. Jeff received his J.D., magna cum laude, from Georgetown University Law Center in 2002, where he was elected to the Order of the Coif and was an editor on the Georgetown Law Journal. He received his A.B. from Stanford University.
Jeff was the winner of the First Annual Stanford Technology Law Review paper competition for his paper, “Spiders and Crawlers and Bots, Oh My," 2002 Stanford Technology Law Rev. 3.
EDUCATION
- Stanford University, A.B.
- Georgetown University Law Center, J.D., magna cum laude
BAR ADMISSIONS
State Bar of California
District of Columbia Bar, U.S. District Court for the Northern District of California, Central District of California, Southern District of California, Eastern District of California, Western District of Wisconsin
The United States Court of Appeals for the Ninth Circuit & Tenth Circuit
MEMBERSHIPS
American Bar Association
Additional Attributes for Jeffrey M. Rosenfeld
- Represented a major internet advertising network in an $11 million federal spam lawsuit by a professional spam plaintiff. Prevailed on behalf of client at summary judgment on all claims in the lawsuit; obtained order awarding over $806,000 in fees and sanctions against the professional spam plaintiff.
- Prevailed on motion to dismiss on behalf of multiple defendants named in a $400 million spam lawsuit brought by a major Washington, D.C. law firm.
- Represented the owners of a popular online dating website against a professional spam plaintiff in a $19 million California spam lawsuit. Obtained a full dismissal with prejudice for one of the firm’s clients at summary judgment and resolved the remainder of the case shortly thereafter.
- Represented an online retailer of printer supplies in a trademark infringement lawsuit brought by a billion dollar printer manufacturer.
- Successfully defended a web development company in a federal trademark lawsuit. After a five-day jury trial, the client defeated all of the plaintiff’s claims, with the jury finding that the plaintiff had not established any valid trademark rights.
- Represented an online merchant in numerous copyright infringement cases where competitors had copied and displayed the client’s product images on the infringers’ own websites. In each case, the firm reached a favorable settlement on behalf of the client.
- Represented a large online merchant in a lawsuit against a payment processor and payment gateway, which alleged that the defendants had skimmed small amounts from each of the client’s online transactions resulting in a total theft of more than $1.6 million. After extensive discovery and motion practice, the parties settled in favor of our client.
- Represented the plaintiff in a federal lawsuit against a large online merchant based on the merchant’s creation and settling of financial instruments without proper authorization. The suit was one of the first to address the federal Restore Online Shoppers’ Confidence Act (ROSCA), and helped define the contours of this important law. The firm ultimately reached a settlement with the defendants in favor of the client.
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Kronenberger Rosenfeld Launches Enhanced Trademark Monitoring Services
Friday, May 17, 2019
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What Exactly Can You Say in a Crowdfunding Campaign?
Thursday, March 09, 2017
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Jeffrey Rosenfeld Authors Law360 Article on Ways to Prevent Becoming a Victim of Wire Fraud
Friday, January 30, 2015
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Jeff Rosenfeld Gives Warning to Individuals Looking to Donate Money During the Holidays
Thursday, November 13, 2014
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Karl Kronenberger Appointed Co-Chair of California State Bar Cyberspace Committee
Monday, September 29, 2014
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Firm Defeats Email Spam Class Action Plaintiff, With Dismissal With Prejudice on Motion to Dismiss
Monday, July 07, 2014
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Kronenberger Rosenfeld Defeats Motion for Class Certification in Defending Putative Class Action
Tuesday, February 14, 2012
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Internet Law Firm Obtains Two Court Orders to Identify Anonymous Defamers
Wednesday, December 14, 2011
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Internet Law Firm Explains ROSCA
Monday, November 28, 2011
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Internet Law Firm Succeeds in Dismissing Lawsuit Against Internet Message Board
Sunday, October 30, 2011
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Ninth Circuit Affirms Kronenberger Rosenfeld’s Victory in Spam Lawsuit
Saturday, July 10, 2010
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Kronenberger Rosenfeld Secures Massive Attorneys’ Fees Order in Spam Lawsuit
Friday, May 21, 2010
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Ninth Circuit Affirms Appointment of Receiver to Collect and Sell Domain Names
Sunday, February 28, 2010
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Ninth Circuit Affirms Kronenberger Rosenfeld’s Summary Judgment in Spam Lawsuit
Saturday, December 05, 2009
-
Internet Law Firm Secures Another Victory in Spam Lawsuit
Thursday, May 21, 2009
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Firm Secures Appointment of Receiver for Transfer of Domains as Method for Enforcing Judgment
Monday, September 10, 2007
- Represented a major internet advertising network in an $11 million federal spam lawsuit by a professional spam plaintiff. Prevailed on behalf of client at summary judgment on all claims in the lawsuit; obtained order awarding over $806,000 in fees and sanctions against the professional spam plaintiff.
- Prevailed on motion to dismiss on behalf of multiple defendants named in a $400 million spam lawsuit brought by a major Washington, D.C. law firm.
- Represented the owners of a popular online dating website against a professional spam plaintiff in a $19 million California spam lawsuit. Obtained a full dismissal with prejudice for one of the firm’s clients at summary judgment and resolved the remainder of the case shortly thereafter.
- Represented an online retailer of printer supplies in a trademark infringement lawsuit brought by a billion dollar printer manufacturer.
- Successfully defended a web development company in a federal trademark lawsuit. After a five-day jury trial, the client defeated all of the plaintiff’s claims, with the jury finding that the plaintiff had not established any valid trademark rights.
- Represented an online merchant in numerous copyright infringement cases where competitors had copied and displayed the client’s product images on the infringers’ own websites. In each case, the firm reached a favorable settlement on behalf of the client.
- Represented a large online merchant in a lawsuit against a payment processor and payment gateway, which alleged that the defendants had skimmed small amounts from each of the client’s online transactions resulting in a total theft of more than $1.6 million. After extensive discovery and motion practice, the parties settled in favor of our client.
- Represented the plaintiff in a federal lawsuit against a large online merchant based on the merchant’s creation and settling of financial instruments without proper authorization. The suit was one of the first to address the federal Restore Online Shoppers’ Confidence Act (ROSCA), and helped define the contours of this important law. The firm ultimately reached a settlement with the defendants in favor of the client.
-
Kronenberger Rosenfeld Launches Enhanced Trademark Monitoring Services
Friday, May 17, 2019
-
What Exactly Can You Say in a Crowdfunding Campaign?
Thursday, March 09, 2017
-
Jeffrey Rosenfeld Authors Law360 Article on Ways to Prevent Becoming a Victim of Wire Fraud
Friday, January 30, 2015
-
Jeff Rosenfeld Gives Warning to Individuals Looking to Donate Money During the Holidays
Thursday, November 13, 2014
-
Karl Kronenberger Appointed Co-Chair of California State Bar Cyberspace Committee
Monday, September 29, 2014
-
Firm Defeats Email Spam Class Action Plaintiff, With Dismissal With Prejudice on Motion to Dismiss
Monday, July 07, 2014
-
Kronenberger Rosenfeld Defeats Motion for Class Certification in Defending Putative Class Action
Tuesday, February 14, 2012
-
Internet Law Firm Obtains Two Court Orders to Identify Anonymous Defamers
Wednesday, December 14, 2011
-
Internet Law Firm Explains ROSCA
Monday, November 28, 2011
-
Internet Law Firm Succeeds in Dismissing Lawsuit Against Internet Message Board
Sunday, October 30, 2011
-
Ninth Circuit Affirms Kronenberger Rosenfeld’s Victory in Spam Lawsuit
Saturday, July 10, 2010
-
Kronenberger Rosenfeld Secures Massive Attorneys’ Fees Order in Spam Lawsuit
Friday, May 21, 2010
-
Ninth Circuit Affirms Appointment of Receiver to Collect and Sell Domain Names
Sunday, February 28, 2010
-
Ninth Circuit Affirms Kronenberger Rosenfeld’s Summary Judgment in Spam Lawsuit
Saturday, December 05, 2009
-
Internet Law Firm Secures Another Victory in Spam Lawsuit
Thursday, May 21, 2009
-
Firm Secures Appointment of Receiver for Transfer of Domains as Method for Enforcing Judgment
Monday, September 10, 2007