When David Solomon takes the reins from Goldman Sachs’ long-serving chief executive Lloyd Blankfein in October, the changeover will be more than just an investment banker succeeding a fixed income trader.

As anyone familiar with Solomon’s Instagram feed will tell you, this part-time DJ, full-time banker is not your typical Wall Street executive. Goldman staff — and the rest of finance — will watch with interest for signs of any cultural shift he may bring at the firm.