Trehan studied abroad, first at Harrow Technical College & School of Arts in London in 1968, learning journalistic photography and later at Columbia University in New York, where she earned a master's degree in journalism in 1971.
Trehan studied abroad in London in 1968. This was first at Harrow Technical College & School of Arts. She earned a master's degree in journalism in 1971. Trehan was learning journalistic photography. Trehan was learning later at Columbia University in New York, where she earned a master's degree in journalism in 1971.