Brock will be based in Singapore and hold responsibility for global trading and brokerage activities across six continents.
Brock has more than 18 years of extensive coal sales, commodity trading and transportation experience.
He was previously the global head of coal and freight at Swiss trading company Gunvor SA, where he managed the worldwide trading activity and business development for coal and dry freight.
He has also served on the board of directors at Signal Peak Mine in Montana, was involved in the management of the Keaton mining project in South Africa, and Gunvor's coal business development in Russia.
Brock earned a Bachelor of Arts with honors from the University of London in history and economics and a Master of Science from the University of London in international trade and economics.
Despite an increase in revenues, Peabody Energy ended 2012 with a sizeable year-on-year loss of more than $US575 million, compared to a profit of $946.3 reported for 2011.
The Missouri-headquartered company said it had $2.02 billion in revenue for the final period of the year ended December 31, a 9.5% drop over the fourth quarter of 2011.
Full-year 2012 revenues were a record $8.08 billion, up 2% year-on-year, due in good part to increased Australian volume and higher realized pricing in the US.