Who served as an advisor from 1998 to the present?

Dr. Mark G. Henderson is the correct answer because he has been a significant figure serving as an advisor since 1998. His expertise and insights have contributed to various initiatives and developments in the field of respectable and meaningful art. This lengthy tenure showcases his commitment and influence in guiding projects and educational programs that align with the goals of MADDRAMA.

The other choices do not reflect the same duration of service as advisors. This distinction underscores the importance of Dr. Henderson's ongoing involvement, which has spanned over two decades, making his perspective and experience particularly valuable in the evolving landscape of the arts.