Concurrently , he worked at his alma mater , the National Physical Laboratory .
Concurrently , he held the position of a deputy director during 1965 -- 69 , and as the director of Solid State Physics Laboratory ( SSPL ) during the period 1969 -- 74 .
Concurrently , he worked at his alma mater , the National Physical Laboratory , and held the position of a deputy director during 1965 -- 69 , and as the director of Solid State Physics Laboratory ( SSPL ) during the period 1969 -- 74 .