Born at Southgate, Middlesex in 1844, Isaac Walker was a right-handed stylish middle-order batsman, right-hand fast, later slow, under-arm bowler and excellent deep fieldsman. He attended Harrow School prior to joining Middlesex in 1862 and he represented the county 144 times until his retirement in 1884. He accumulated 6,064 runs (av. 25.48) including four centuries with a top score of 145 and he took 152 wickets (av. 20.73) with a best performance of 6 for 42 and he held 138 catches. His best season was 1868 when he scored 661 runs (av. 34.78). He captained the county from 1873 to 1884 and continued as a committee member until his death. He had been associated with the county club since its foundation in 1864, and in fact scored 102 on his county debut versus Surrey Club at the Oval in 1862. He died at Regent's Park, London in 1898.