The two business leaders will oversee the judging process of the media industry’s biggest night of the year.
MacCallum and Gorman will help steer more than 70 leaders from across the media, marketing and related sectors over five days in September.
Now in its 30th anniversary year, the Media Week Awards 2015 will include stalwart categories Agency of the Year, Sales Team of the Year, Media Idea, Media Brand of the Year and Rising Star.
New additions for 2015 include recognition for the Best Industry Research produced by a trade or marketing body, the Best Commercial Use of Content and the Best Long-Term Media Strategy.
After a successful debut last year, the awards will again include the Best Use of Data in the buying space, with the focus on transparency and efficiency for a business increasingly driven by programmatic trends.
MacCallum said: "I am delighted to have been asked to co-chair this year’s awards with Rosemary. The challenge for agencies and media owners to turn complexity into brilliant solutions has never been greater, but more than ever there is some incredible talent in the industry applying creativity, technology and innovation to deliver tangible benefits to their clients business.
"The Media Week Awards is an opportunity to champion the people, the collaborations and the ideas that are making a difference, and I’ve no doubt that the task of identifying the very best work is going to be as tough, and as fiercely debated by the judges, as it always is."
The awards night itself will take place on the 22 October 2015 at the Grosvenor House in London.
The UK’s media business, with its range of TV, press, outdoor and radio, as well as digital pureplay operations, is an undisputed global leader that continues to innovate.
Helping to propel the sector’s growth is the largest internet advertising market in Europe, which is set to see a compound annual growth rate of 10.6 per cent forecast over the next five years to £11.7 billion, according to PricewaterhouseCoopers.
Media Week's editor, Arif Durrani, said: "It’s fantastic to have such respected leaders as Ali and Rosemary lead this year's awards judging. They have both been regular judges over the years and they understand the process as well as anyone.
"The annual extravaganza that is the Media Week Awards remains the best opportunity to showcase the industry’s innovation and successes involving bought, owned and earned media in the UK.
"This year will see a greater emphasis placed on explaining why the winning campaigns have shone through and at promoting the industry at large."
For more information and to enter this year’s awards visithttp://www.mediaweekawards.co.uk/