October 30, 2007 (New York, NY) - Proskauer Rose LLP, an international law firm with more than 750 lawyers worldwide, has represented J.P. Morgan Securities Inc. in its role as lead financial advisor to Oglebay Norton Co., which agreed to be acquired by Carmeuse North America for $520 million in cash. The deal is valued at approximately $700 million, including debt.

Oglebay Norton is a Cleveland-based provider of essential minerals and aggregates to a broad range of markets from building materials and environmental remediation to energy and industrial applications. Pittsburgh-based Carmeuse North America, a wholly owned subsidiary of Carmeuse Group, is the largest producer of lime and limestone products in North America.

J.P. Morgan Securities Inc. acted as lead financial advisor to Oglebay Norton and provided a fairness opinion to the company. The Proskauer team representing J.P. Morgan included Jeffrey Horwitz, Julie Allen and Jon Oram.

The transaction is the latest significant matter Proskauer has handled on behalf of longtime client J.P. Morgan. In March, the firm represented J.P. Morgan U.S. Corporate Finance Investors III in connection with the acquisition of RoadLink Holdings Inc.

Proskauer's Corporate Department consists of over 200 lawyers worldwide counseling clients in the full range of sophisticated financial transactions and daily business and regulatory matters including mergers & acquisitions, capital markets, private equity, finance, and bankruptcy. The firm's transactional practice includes: public and private mergers and acquisitions; public securities offerings, including IPOs; private equity fund transactions, including formation of private equity funds and leveraged buyout funds, and investments by institutional and private investors; private placement of securities and private financing; and leveraged buyouts and structured finance.