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Nathan D. Wirtschafter




Nathan D. Wirtschafter is a California business trial attorney, who has been admitted to practice law since 1995 and is the principal of the firm.


Mr. Wirtschafter’s expertise is collecting past-due accounts receivable and promissory notes.  His law practice encompasses a broad range of business matters, including complex business disputes between companies, business collections, civil lawsuits, employment, transactions and international litigation.  He has also handled corporate litigation on behalf of owners, executives and companies, including multiple successes against publicly traded companies.

Mr. Wirtschafter represents several companies in their California business disputes.  Industries include the following: professional staffing, therapy services, hospitality-hotels, software, medical device solutions, ad-tech, health care, occupational medicine, and locum-tenens.

Mr. Wirtschafter provides the legal strategy that is best from a cost/benefit perspective.  He gives unbiased advice, creates options, and promptly returns calls.  Perhaps most important, he is comfortable in a courtroom, whether in state or federal court, in trial or on appeal, or before a mediator or an arbitrator.

Contact Mr. Wirtschafter at (818) 660-2518 or

Nathan Wirtschafter May 2009 Photo for W

Education, Bar Admissions and Languages


College & Law School


Born in California, Mr. Wirtschafter earned his B.A. and M.A. in History from Johns Hopkins University and wrote his thesis about management scholar Peter Drucker.


In 1995 Mr. Wirtschafter graduated from Loyola Law School after serving as a published editor of the Loyola Law Review and as the President of the Student Bar Association.

Bar Admissions


State Bar of California

California Supreme Court

United States District Court, Central, Southern, Eastern and Northern Districts

United States Bankruptcy Court, Central and Southern Districts

Ninth Circuit Court of Appeals


English and Hebrew

Representative Matters


Business & Corporate Litigation

Won arbitration award of over $1.2 million against two divisions of a publicly traded company for breach of fiduciary duty, in disputed appraisal of business interest.  Two directors were also held personally liable. Respondent awarded nothing on its $3 million counter claim. Award upheld by California Court of Appeal.


Successful defense of $2 million business litigation by publicly traded Silicon Valley company against a former executive.  Case voluntarily dismissed.


In New York matter, during depositions of company owners, achieved settlement of $1.15 million in exchange for interest in operating business; cross-complaint of $500,000 dismissed.  Case litigated under the commercial rules of the American Arbitration Association.

Obtained settlement in excess of $900,000 following Los Angeles Superior Court litigation between business partners; cross-complaints dismissed.


Regularly handles business disputes arising from day-to-day operations for several companies in California courts.


Pre-Litigation Business Collection


One letter + one letter = $850,000.  Settled collection action in California after credible threat of a writ of attachment; Defendant represented by San Francisco office of law firm with 700+ attorneys.


In pre-litigation collection matter, secured promissory note from debtor totaling over $925,000 after threats that the firm would file lawsuit along with writ of attachment.


In pre-litigation collection matter, assisted client in securing promissory note from California business debtors totaling approximately $700,000; debtors’ principals also agreed to be personally liable for payment.


In pre-litigation collection matter, secured promissory notes totaling approximately $1.24 million; full amount owed plus interest; debtors’ principal and related companies also agreed to be liable for payment of notes.


Business Collection

Total value of settlements, collections and judgments from 2009 to 2019 is over $15 million. 


Settled business collection lawsuit for $1.98 million following deposition of defendant’s principal.


Settled business collection lawsuit, against corporation and its ownership, for over $270,000 as case approached trial date.

Collected over $200,000 on judgment won by another law firm from San Diego Bankruptcy Court; client recovered 107% of face-value of judgment.


Post-judgment collection after discovering pending acquisition; service of writ of execution led to the payment of the six-figure debt in full with interest.


Civil Litigation


Won judgment at trial in the amount of approximately $580,000 for violation of California’s Unlicenced Contractor Statute; finding of personal liability based on alter ego and other grounds.


Prepared brief to Ninth Circuit Court of Appeals to successfully defend judgment in favor of hospital against appeal by foreign insurance company. Case valued in excess of $300,000.


Obtained insurance settlement for $270,000 for failure to provide coverage.

Resolved a California Superior Court case for only 7% of the seven-figure demand in the employment/theft of trade secrets lawsuit.


International Disputes


In federal court lawsuit brought by Israeli company, won plaintiff’s motion for summary adjudication for approximately $657,000 against publicly traded company; cross-complaint voluntarily dismissed before trial.


In federal court lawsuit, after filing application for writ of attachment; obtained settlement of almost $600,000 for Israeli manufacturer from a California debtor.


Recovered $525,000 for defrauded Israeli real-estate investor, full principal, plus interest and partial payment of attorneys fees via bankruptcy court.


Regularly represents two large multi-national Israeli companies in their respective California business collection and civil litigation matters.


Business Transactions


Negotiated and represented landowner in seven-figure solar-power land acquisition deal.


Assisted entrepreneur with placement of angel investment with provider of internet products for social media and marketing. 

Inked seven-figure purchase of travel agency, including post-transaction employment agreements.


Negotiated several executive employment agreements on behalf of both employers and employees.


Provides ongoing advice to several companies about changes in California law, including California Consumer Privacy Act, also reviews and revises standard agreements.

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