He ended his partnership with Pharazyn and the business activities were taken over by his eldest son W H Levin in partnership with Charles Pharazyn and Walter Woods Johnston.
On his return from education in France he worked in his father's business, Johnston & Co but in March 1868 he joined with Charles Pharazyn and William Levin as partners in W H Levin & Co when Nathaniel William Levin retired to return to England.
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