CHICAGO – January 10, 2006 – Dresner Partners announced that it acted as the exclusive financial advisor to Bio-logic Systems Corp. in its recent merger with Natus Medical Incorporated (Nasdaq: BABY). Natus announced the completion of the merger on January 5, 2006. Natus develops, manufactures and markets products for the detection, treatment, monitoring and tracking of common disorders in newborns and children.

Dresner Partners, a NASD-registered, middle-market investment bank, advised Bio-logic on the transaction and provided a fairness opinion to the board of directors of Bio-logic. Mundelein, Illinoisbased Bio-logic develops and markets computer-based electrodiagnostic systems and disposable supplies used by medical practitioners to aid in the detection, diagnosis and monitoring of certain hearing, neurological and sleep disorders.

Gabriel Raviv, chairman and chief executive officer of Bio-logic, said, “I believe the expanded opportunities provided through this acquisition will accelerate sales of our technologies into the marketplace and will benefit both our employees and our customers.”

“Natus Medical and Bio-logic Systems are among the most respected brand names in the medical technology sector,” said Steven M. Dresner, president of Dresner Partners. “This merger is highly complementary, strengthening both businesses and enhancing growth opportunities for the combined organizations. Our ability to enhance shareholder value in the context of this transaction was a function of our long-standing relationship with and in-depth knowledge of Bio-logic, as well as our expertise in middle-market health care transactions.”

About Dresner Partners Dresner Partners is a NASD-registered, middle-market investment bank based in Chicago, Illinois. Founded in 1991, Dresner Partners provides financial advisory services to business owners and managers throughout the United States, including institutional private placements of debt and equity, merger & acquisition advisory, and valuation and strategic consulting.