Hastings Water Works, a Brecksville, Ohio, pool-maintenance and lifeguard-staffing firm, uses Twitter and Facebook to find and hire summer employees.

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Dzhokar Tsarnaev had worked as a lifeguard at a pool at Harvard University, said George McMasters, who hired him about two and a half years ago and said he was impressed with his work ethic.

CNN: Suspects described as brothers from Russian Caucasus

Dzhokhar Tsarnaev had worked as a lifeguard at a pool at Harvard University, said George McMasters, who hired him about two and a half years ago and said he was impressed with his work ethic.

CNN: Suspects described as brothers from Russian Caucasus

In the summer of 1989, I was a lifeguard at the local pool.

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Inside the 76-story tower's rippled steel exterior lies a lifeguard-manned swimming pool and sun deck, a boxing studio, a children's library, a grilling terrace with "dining cabanas, " a billiards room, a squash court and a golf simulator, just to name a few.

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