More than three months into a medical leave from Apple, chief executive Steve Jobs remains closely involved in key aspects of running the company, the Wall Street Journal reported on Saturday, citing people familiar with the matter.

Chief operating officer Tim Cook runs the day-to-day operations, but Jobs has continued to work on the company's most important strategies and products from home, the newspaper said in a story on its website.

He regularly reviews products and product plans, and was particularly involved in the user interface of the new iPhone operating system that Apple unveiled last month, the Journal said.