Which of the following roles is not included among the Texas TSA leadership team?

The role identified as not being part of the Texas TSA leadership team is the Chairman. In Texas TSA, the leadership team typically comprises positions that have a defined structure to govern and lead the organization effectively, such as the President, Executive Director, and Treasurer. Each of these roles has specific responsibilities that contribute to the organization’s mission and operations.

The President is usually responsible for guiding the organization's vision and leadership, while the Executive Director often oversees the management and administration of the organization. The Treasurer maintains the financial integrity and oversees budgeting and financial planning. The position of Chairman, while common in many organizations, does not have an established role within the Texas TSA's leadership structure, making it the correct choice in this context.