Elton Mayo conducted the famous Hawthorne Experiments between 1927-1932 which studied how social and psychological factors impact productivity in the workplace. The experiments found that social bonds within work groups and feeling valued by management significantly increased worker output, more so than physical factors like lighting. Mayo concluded that work arrangements must satisfy both objective production needs but also employees' subjective needs for social satisfaction. The experiments demonstrated the importance of socio-psychological factors in maximizing productivity.