Grosvenor was born in Guyana, a British colony on the main land of South America. He received his undergraduate education in Zoology and Chemistry with a minor in Classics in the United States. His graduate science studies were done in Evolution and Ecology. For his Theological education, he attended St. Mary's University in San Antonio, Texas. After his ordination to the priest hood, he ministered in the Anglo-Catholic church in the US and in South Africa. He later returned to Guyana and worked for eight years as curate in the Anglican Province of the West Indies. His area of interest is the English Reformation especially under Henry VIII.