SERIES FINALE: COMING UP ON "ROCK CENTER WITH BRIAN WILLIAMS" - FRIDAY, JUNE 21 AT 10P/9C

Reports from Brian Williams, Harry Smith, Kate Snow, Dr. Nancy Snyderman and Chelsea Clinton

Some activists for the disabled are criticizing Goodwill for paying some of its workers far less than the minimum wage, while its executives earn hundreds of thousands of dollars. Harry Smith goes behind the scenes at Goodwill to investigate.

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Undeterred by the tragedy visited upon her family as a result of the Boston marathon bombing, double amputee Celeste Corcoran, who we have been following since the horrific tragedy, is now taking her first steps on new prosthetics. Kate Snow tells her amazing tale of survival and renewal.

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A rare look inside the community of about 300,000 Brooklyn Hasidic Jews whose members strive to keep out all secular influences- and remain isolated while living in the middle of America's biggest city. But what happens when some of their followers want to see "what's on the outside?" Dr. Nancy Snyderman follows the experiences of four people who left the community.

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Chelsea Clinton asks fashion designer Stella McCartney about the benefits and challenges of having famous parents. Stella's father, Sir Paul, explains why his daughter embraced vegetarianism at a young age, and today, uses no leather or fur in her fashions.

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Brian Williams wraps up the broadcast with #ROCKBOTTOM.

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David Corvo is the senior executive producer, Alexandra Wallace is the executive producer and Brian Williams is the anchor and managing editor of "Rock Center with Brian Williams" (Fridays at 10p/9c). Follow us at RockCenterNBC.com, facebook.com/rockcenterNBC and @rockcenterNBC/#RockCenter.