A subcontractor has a contract with the contractor for the services provided - an employee of the contractor cannot also be a subcontractor. Subcontractors undertake work that a contractor cannot do but for which the contractor is responsible.
Theodore Roosevelt became President in 1901 when President William  McKinley was assassinated that year. Roosevelt became the 26th  President of the United States.
Theodore Roosevelt, who came into office in 1901 and served until 1909, is considered the first modern President because he significantly expanded the influence and power of the executive office.