Mr. Gondry's use of nonprofessional actors makes sense when exploring parts of the city that more often are exploited or ignored at the cinema.

WSJ: A Bronx Tale Unlike the One Hollywood Tells

Filming on location with nonprofessional actors drawn from locals along the Ohio-West Virginia border, Steven Soderbergh revitalizes the eternal triangle with a low-key yet ravishing homespun neorealism.

NEWYORKER: Bubble

Nonprofessional options investors can be divided roughly into three groups.

FORBES: Magazine Article

Chinese intelligence practices rely on nonprofessional collectors motivated by profit, patriotism or other factors and acting either independently or on behalf of the Chinese government to gather science and technology intelligence.

FORBES: Entrepreneurial Espionage - Made in China

Experiments measured the forces and acceleration of a regulation, adult-size-5 ball propelled repeatedly at a magnesium dummy-like head at 18 meters per second, which is considered the average speed a ball is kicked by nonprofessional players.

WSJ: Soccer 'Header' Impact Likened to Hard Punch