Who was the governor of maryland in africa?

There were 6 official governors (1 acting twice, and 1 acting twice on an official capacity and once on an unofficial capacity) of Maryland-In-Africa from the time it was founded (on 12 February 1834 by the Maryland State Colonization Society) until it was incorporated into The Republic of Liberia on 18 March 1857:

12 February 1834 to February 1836 = James Hall
February 1836 to 1 July 1836 = Oliver Holmes, Jr.
1 July 1836 to 28 September 1836 = No Governor there was a Three-Man Committee
28 September 1836 to 2 February 1841 = John Brown Russwurm

During the State of Maryland in Liberia:

2 February 1841 to 9 June 1851 = John Brown Russwurm
9 June 1851 to 1852 = Samuel Ford McGill (acting Governor)
1852 to 29 May 1854 = Samuel Ford McGill (official Governor)

During the The Independent State of Maryland in Liberia:

29 May 1854 to 8 June 1854 = Samuel Ford McGill
8 June 1854 to April 1856 = William A. Prout
April 1856 to 18 March 1857 = Boston Jenkins Drayton