Lawrence R. Seidman, a former partner in the Baltimore law firm of Hogan & Hartson LLP who was a respected and skilled negotiator in the field of corporate security law, died of brain cancer July 7 at Gilchrist Center for Hospice Care. The longtime Owings Mills resident was 45.

Mr. Seidman, who had been named partner of Hogan & Hartson in 1999, retired in 2004 after being diagnosed with a brain tumor.

Born in Baltimore and raised on Fallstaff Road, the son of an attorney and a dental hygienist, Mr. Seidman was a 1982 graduate of the Gilman School. He earned a bachelor's degree in 1986 from the Wharton School of the University of Pennsylvania, and his law degree from the University of Maryland School of Law in 1991.

From 1986 to 1988, he was a corporate finance associate at Janney Montgomery Scott Inc. in Philadelphia, and a law clerk at Frank, Bernstein, Conaway & Goldman in Baltimore from 1988 to 1991.

Mr. Seidman was an associate at Piper & Marbury LLP from 1992 to 1998, when he was made a partner in the firm. He joined Hogan & Hartson in 1999.

Mr. Seidman's legal expertise focused on the representation of emerging growth companies in all aspects of corporate and securities law and the representation of venture capital firms that finance these companies.

He represented a wide range of companies from business services to telecommunications, technology, biotechnology, consumer products and services, and privatized government services.

"I've known Larry since 1991, and he made partner at Piper & Marbury in record time in the modern era," said Henry D. Kahn, a partner at Hogan & Hartson. "He was an extraordinarily talented individual and early on took on a tremendous amount of responsibility and work."

He said Mr. Seidman had a portfolio of noteworthy clients, some of which included Alex. Brown & Sons, Duratek and Under Armour.

"He was also counsel to executives and boards," Mr. Kahn said.

"Larry had a very quiet demeanor yet was a very determined and disarming negotiator. He was tough but did it in a non-combative way," he said.

"He was patient and persistent and stuck to his points," Mr. Kahn said.

Kevin Plank, the founder and CEO of Under Armour, was another longtime client.

"Larry was one of those guys who changed my perception of attorneys. He was very sharp and I respected the guy," Mr. Plank said.

"He had aptitude, smarts, and had plenty of business wisdom. He was always trying to do the best deal for the company," Mr. Plank said. "He helped me personally identify the principles of long-term success and steered us in the right direction."

Mr. Kahn recalled the onset of Mr. Seidman's fatal illness in 2004.

"His career kept blossoming and had just hit its stride when he was diagnosed with his disease. He was given a very grim diagnosis," he said.

Mr. Seidman retired in order to fight his cancer.

Mr. Kahn said his friend fought back with a combination of courage and determination, and after his first radiation treatment in 2004, attended his son's bar mitzvah, swearing he'd get there even if he had to go on a gurney.

Mr. Seidman changed his diet, exercised and fought to stay well, while trying to lead a normal life. He attended his children's soccer and basketball games, helped with their homework, and got them off to school in the morning.

His family and health became his two major priorities, Mr. Kahn said.

"It was always about how Larry could help, not how he could be helped," Mr. Kahn said in his eulogy.

Mr. Seidman also made genetic material from his tumor available to clinicians and researchers which resulted, Mr. Kahn said, in a significant discovery of how cancer cells behave like stem cells.

Mr. Seidman was an avid runner and enjoyed traveling and vacationing at Bethany Beach, Del. He was a former member of Chestnut Ridge Country Club.

He was a member of Har Sinai Congregation.

Services were Thursday.

Surviving are his wife of 18 years, the former Jill Reynolds, associate general counsel for the Cordish Cos.; a son, Eric Reynolds Seidman, 9; a daughter, Jordyn Reynolds Seidman, 12; his parents, Herbert A. and Marilyn Seidman of Baltimore; and a sister, Carol Tendler of Robbinsville, N.J.

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