Question: Steve Neil was a business executive at what American packaged food company that specializes in marketing nuts?

Context paragraphs:
Tnuva: Tnuva, or Tenuvah, (Hebrew: תנובה‎ ‎ , "fruit" or "produce") is an Israeli food processing cooperative (co-op) historically specializing in milk and dairy products.  The cooperative is controlled by a Chinese state company since 2014.  The 620 members of the cooperative are made up of a large number of kibbutzim (collective farms) and moshavim (agricultural communities).  Tnuva is the largest food manufacturer in Israel; its sales account for 70% of the country's dairy market as well as sales of meat, eggs and packaged food.

Liberty Orchards: Liberty Orchards is a packaged food products company located in Cashmere, Washington.  Founded as an apple farm in 1918 by Armenian business partners Armen Tertsagian and Mark Balaban, the company moved into canning and then confectionery during the 1930s and 1940s.

Post Holdings: Post Holdings, Inc., headquartered in the Suburban St. Louis community of Brentwood, Missouri, is a consumer packaged goods holding company operating in the center-of-the store, foodservice, food ingredient, private label, refrigerated and active nutrition food categories.  Its Post Consumer Brands business manufactures, markets and sells branded and private label cereal products.  Its Michael Foods Group business supplies value-added egg products, refrigerated potato products, cheese and other dairy case products and dry pasta products to the foodservice, food ingredient and private label retail channels.  Its active nutrition business markets and distributes protein beverages, bars and gels.  Its Private Brands business manufactures private label peanut butter and other nut butters, dried fruits, baking and snacking nuts, cereal and granola.

Imperial Cold Storage and Supply Company: Imperial Cold Storage and Supply Company (ICS) was one of the largest meat processing, storage, distribution and marketing companies in South Africa, dominating the South African packaged food sector for almost a hundred years.  The company was formally registered and listed as ICS in 1899, originally it grew out of Combrinck & CO. which was founded in 1830 in Cape Town.  Combrinck & CO. was then merged into ICS.  ICS was one of the largest meat processing and distribution companies in the world.  The company originally concentrated on supplying ships, but would go on to develop the first cold-storage enterprise in South Africa in conjunction with the Union and Castle shipping lines.  Sir David Graaff, 1st Baronet was a founder, chairman and major shareholder.

Steven M. Neil: Steven M. Neil is a business executive best known for being the CAO, EVP, and CFO at Diamond Foods from March 2008 to 2012.  He was also the Director of Diamond Walnut Growers.  Before joining Diamond Foods, Neil held executive positions at several specialty healthcare manufacturing companies including Perrigo Company, the Cooper Companies, Ocular Sciences Inc., and Sola International.

Conagra Brands: Conagra Brands Inc. is a North American packaged foods company headquartered in Chicago, Illinois.  Conagra makes and sells products under various brand names that are available in supermarkets, restaurants, and food service establishments.

U.S. Mills: U.S. Mills is a packaged food products company specializing in natural, organic, and specialty cereals, cookies, and crackers.  Their products are sold through supermarkets, wholesale grocers, and natural food distributors nationwide.  Their brands include Uncle Sam Cereal, Erewhon, New Morning, Skinner's Raisin Bran, and, formerly, Farina.

Diamond Foods: Diamond Foods is an American packaged food brand originally based in Stockton, California, specializing in marketing nuts, particularly walnuts and almonds.  Its brands include Kettle Brand chips, Emerald snack nuts, Pop Secret popcorn, and Diamond of California snack and culinary nuts.  As of 2016, the brand is a wholly owned property of Snyder's-Lance.

WhiteWave Foods: WhiteWave Foods was an American consumer packaged food and beverage company that manufactures, markets, distributes, and sells branded plant-based foods and beverages, coffee creamers and beverages, premium dairy products and organic produce throughout North America and Europe.  WhiteWave was purchased by Danone and now does business as DanoneWave.

Graphic Packaging: Graphic Packaging International, Inc. () is a Fortune 1000 corporation based in Sandy Springs, Georgia.  It is a leading company in the design and manufacturing of packaging for commercial products.  GPI manufactures paperboard and folding cartons for a wide range of popular consumer goods, particularly beverages and packaged food.  The company operates a mill in West Monroe, Louisiana, and in Macon, Georgia, that uses recycled municipal wastewater in the manufacture of food grade cardboard.  Its President and Chief Executive Officer is Michael P. Doss.

Supporting paragraphs: Steven M. Neil Diamond Foods
Answer: Diamond Foods