His picture was being sold on ebay for $20. The description below is taken directly from the ebay advertisement....
"Early In the seventeenth century, Elder John ****, of England, crossed the ocean and settled in New England, where large numbers of his descendants, many of whom have occupied positions of trust and responsibility, have since resided. Among the descendants of the sixth generation was Theodore ****, LL.D. He was the son of the Rev. Joseph ****, of Heath, Massachusetts, a man of talent and great energy, and of Sophia Woodbridge, a daughter of the Rev. John Woodbridge, of South Hadley.... Professor Theodore **** was born at South Hadley, Massachusetts, July 26, 1790.

After attending school, and preparing for college under the direction of a clergyman, he entered Yale when eighteen years of age. He was graduated in 1812, taking a high stand in all his studies and receiving the prize in mathematics, in which science he had acquired much proficiency.

He at once became tutor in Hamilton College, Clinton, New York, and held the position until 1816. In that year he was chosen professor of mathematics and natural philosophy, and remained there as such for eleven years. In 1827 he accepted the same position in Rutgers College, New Brunswick, New Jersey, where he continued until 1862, thirty-five years.

During his connection with Hamilton College, the attention of scientific men was called to Professor **** by his solution of several difficult mathematical problems. He demonstrated the theorems respecting the circle, which had been propounded as a challenge to the world by Dr. Matthew Stewart in 1746. His ingenious demonstration was published in the *Memoirs of the Connecticut Academy of Sciences*. He studied the works of La Grange, Laplace, and other great mathematicians, and whatever was necessary for a thorough comprehension of mathematics. He was also deeply interested in other studies, in history, in mental philosophy, and in theology. His mental constitution and habits forbade him to yield his assent on any subject, without sufficient evidence, and his own conclusions were carefully reviewed before offering them to the inspection of others.

Professor *** devoted the greater portion of his life to his favorite science. His profound knowledge of mathematics, and his success in the solution of difficult and important questions, excited the admiration of men of science, many of whom consulted him upon points of scientific interest. He was fond of being questioned, and of discussion and disputation. In his professional duties in the class and lecture-room, he presented his original views and deductions of the subject under discussion, with clearness, simplicity, and able illustration. His interest in the work roused the interest of the students, while his manner in imparting instruction gained their attachment and respect.

Professor **** was an
honorary member of the Connecticut Academy of Arts and Sciences, the American Academy of Arts and Sciences, the American Philosophical Society, and was one of the original members of the National Academy of Arts and Sciences, He received the honorary degree of Doctor of Laws from Rutgers College in 1835, and the same degree from Hamilton College.

He was a frequent contributor to mathematical journals, and to the learned
societies of which he was a member. He made a number of important contributions to *Silliman's American Journal of Science*. He communicated to the first volume, which was published in 1818, a new geometrical demonstration of the values of the sines and cosines of the sum and difference of two arcs, together with the solution of a difficult diophantine problem. Among the other journals to which he contributed miscellaneous papers were *The Mathematical Journal*, *The Scientific Journal*, *The Mathematical Diary*, *The Mathematical Miscellany*, *The Cambridge Miscellany*, and *The Mathematical Monthly*.

In these papers were many new and entirely original demonstrations and discussions of various difficult subjects. His two largest and best-known works are the *Treatise on Elementary and Higher Algebra*, a work original in its method and in many of its conclusions, which was published in 1859, and a volume on the *Differential and Integral Calculus*, written in 1867, but not published until after the death of the author. For original investigation and profound knowledge of the subject they cannot be excelled. They contained much that was new, among which were the solution of Cardan's Irreducible Case of Cubic Equations, which had baffled the best mathematicians of Europe,
and a method of extracting, by a direct process, any root of any integral number.

Professor **** died at New Brunswick, New Jersey, February 1,1869."

Answer:
Theodore Strong (1790 - 1869)