Ernest Marsden died in 1970.
Hans Geiger, Ernest Marsden (under Ernest Rutherford).
If you're talking about the experiment with the alpha particles, then it was Hans Gieger and Ernest Marsden.
They were under the supervision of Rutherford
Simon Marsden died in 2012.
Walter Marsden died in 1969.
Dennis Marsden died in 2009.
Edward Marsden died in 1932.
Frank Marsden died in 2006.
Tom Marsden died in 1843.
William Marsden died on October 28, 2006.
Marsden Hartley died on 1943-09-02.
Evelyn Marsden died on 1938-08-30.