He is a zoologist and environmental biologist , who was awarded the Royal Geographical Society 's Founder 's Gold Medal in 1995 .
As of 2010 the titles are held by the latter 's great - grandson , the fifth Earl , who succeeded his father in 1978 .
Earl is a Earl and environmental biologist , who was awarded the Royal Geographical Society 's Founder 's Gold Medal in 1995 .
As of 2010 the titles are held by the latter 's great - grandson , the fifth Earl , who succeeded his father in 1978 .