Julian took holy orders, serving as Chaplain at Hampton Court Palace and Rector of Ilmington, Warwickshire, and married, on 26 April 1832, Elizabeth Anne Georgiana, daughter of James Willis (of that family of Atherfield, Isle of Wight), Consul-General- later Governor- of Senegambia.
Bawol (or Baol) is an ancient kingdom formerly ruled by the Joof family, one of the members of the Serer ethnic group found in Senegambia.
With Achille Richard (1794–1852) and George Samuel Perrottet (1793–1870), he was co-author of a work on the flora of Senegambia (geographic location of present-day Senegal and Gambia) titled Florae Senegambiae Tentamen... (1830–1833).
He orchestrated a program of expansion and consolidation which extended the empire from Taghaza in the North to the borders of Yatenga in the South; and from Air in the Northeast to Futa Tooro in Senegambia.
On the basis of DNA markers linked to the sickle cell anemia gene, he demonstrated that the Brazilian black population is predominantly of Bantu origin, with a lesser contribution from the Benin and very little contribution from the Senegambia.
Sonko-Godwin, Patience, "Ethnic groups of the Senegambia Region, Sunrise Publishers Ltd (2003), ISBN 9983-9900-6-2