From Sesame Street to Fleet Street was the headline which sprang to mind when US digital media guru Jason Seiken was revealed as the new editor in chief and “chief content officer” of Telegraph Media Group last September.

He had made his name by turning venerable US TV brand the Public Broadcasting Service into a YouTube hit and by launching a host of successful mobile and tablet computer apps.

This week he appeared to flex his muscles for the first time with the news that Daily Telegraph editor Tony Gallagher was out and that his role was being divvied up between existing staff Chris Evans and Ian MacGregor, to edit the paper on weekdays and at weekends respectively.