Apple's New COO is Jeff Williams

One of the biggest tech companies in the world today is making some major changes in their leadership just before the year 2015 ends.

Apple recently announced their new COO and revealed that there will be other role shifting that would surely make next year's operation interesting.

The position has been vacant for four years, after the company's former Chief Operating Officer Tim Cook was promoted as Apple's CEO. This Thursday, though, the company made a decision that would certainly contribute to their milestone as one of the leading tech giants as they gave the position to Jeff Williams, as reported by Wall Street Journal.

The current CEO said in a statement that the newly-appointed COO, Williams, is the best person he ever worked with.

The new COO will be added to the company's C-level executive, along with Cook, Chief Design Officer Jony Ive and Luca Maestri, who is Apple's senior vice president and Chief Financial Officer.

According to a report by ReCode, Williams, who joined the company in 1998, has been the main man in Apple's success of expanding globally and become one of the leaders in the market today. One of his responsibilities was to make sure Apple stays on growing and make major impacts in the international tech scene.

He will be handling new key products including the Apple Watch, which is the company's new product category after five years. The Apple Watch has already been considered by many as a huge success after being widely received by consumers.

Although Apple is one of the most successful companies in the world, many investors are starting to get more nervous about the direction it is going. In 2014, Apple enjoyed an overwhelming growth in their sales after the release of the new iPhones.

The device was widely received because of its bigger screen and new features. However, many analysts predicted that iPhone sales may rapidly go down in the very near future.

The 13 percent drop in the company's shares is also a good indication that the new team of executives will have work overtime to maintain stability, WSJ added.

Other announcement made by the company on Thursday is to make an adjustment with the leadership team after two executives, John Browett and Scott Forstall, were fired. The two were responsible for managing retail and mobile software before they were ousted.

Burberry Group PLC's Angela Ahrendts and Xerox Corporation's Chief Financial Officer Luca Maestri were earlier brought in by Cook to cover vacant positions and maintain structure in the company, as reported by the news portal.