Who is this person?

[RJNorton]

Excellent, Dennis!! Yes, indeed it was Carpenter.

"Mr. Lincoln's height was six feet three and three-quarter inches in his stocking-feet. He stood up, one day, at the right of my large canvas, while I marked his exact height upon it."

SOURCE: p. 217 of "The Inner Life of Abraham Lincoln: Six Months at the White House" by Francis B. Carpenter (University of Nebraska Press, Lincoln, Nebraska, 1995).