Final answer:
Frederick Taylor's principles of scientific management, known as Taylorism, have been used by Amazon and FedEx to standardize job tasks for enhanced efficiency.
Step-by-step explanation:
The management theorist whose ideas have been updated and used by Amazon and FedEx to maximize efficiency by standardizing techniques for completing tasks is Frederick Taylor. Taylor's approach, termed Taylorism or scientific management, focused on optimizing work processes through breaking down tasks into simpler motions and standardizing them to improve productivity and reduce wasted time. Amazon and FedEx, being companies that prioritize efficiency in their operations, have incorporated principles of Taylorism to enhance their logistic and operational processes. Frederick Taylor's legacy continues to influence modern management practices, advocating for systematic analysis and standardization as means to achieve maximum efficiency in the workplace.