Each specialises in contemporary Canadian art, ranging from photoconceptualism to sculpture, abstract painting to First Nations artworks.
He has founded a firm called Trebletap which specialises in making art from war relics.
"They are a technology company that specialises in Bluetooth integration with your phone, " says Mr Levine.
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It specialises in educating local people: more than 70% of its students come from the north-east.
Virgin Atlantic specialises in long-haul routes to North America, the Caribbean, Africa and Asia.
The casual restaurant, which specialises in the food of southeastern Anatolia, is an ideal lunch destination.
The virus was discovered by a Russian security firm that specialises in targeting malicious computer code.
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Hydrasun specialises in fluid control equipment and solutions for the global offshore oil and gas sector.
It specialises in three main areas - traditional dating, casual dating and niche dating sites.
Professor Nuria Mas from Spain's IESE business school specialises in the economics of healthcare policy.
Dr Axel Klein specialises in the study of addictive behaviour at the University of Kent.
The school offers riding for children and adults and specialises in providing riding for disabled people.
Parsons, which was founded more than 100 years ago, specialises in power generation and motors.
Autonomy was set up by researchers at Cambridge University and specialises in pattern-recognition technologies.
Phages are parasites of bacteria, and the phage that Sequella works with specialises in M. tuberculosis.
Only one restaurant in all of Tokyo, a gourmet's paradise, specialises in whale cuisine.
Glyn Berwick, of Penny Brohn Cancer Care, which specialises in offering nutrition and exercise advice, agreed.
In January the firm snapped up Quattro Wireless, which specialises in advertising on mobile handsets.
And whereas Henkel is focused on industrial glue, National Starch specialises in glue for consumers.
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Threshold is based in Belfast and specialises in providing therapeutic communities to combat mental health disorders.
Doro is a company that specialises in big button phones and other products aimed at elderly people.
Alongside the Rialto fish market, deli-diner Pronto Pesce specialises in crudi (Venetian-style sushi) and seafood salads.
Gareth Mitchell, a solicitor who specialises in cases involving immigration detainees, said legal action was a possibility.
Sun Microsystems, which specialises in high-end server computers, is adding much more software to its product mix.
The chartered health psychologist, Dr Lisa McNally, who specialises in NHS stop smoking services, also emphasised other factors.
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The South Korean firm, which specialises in smartphones and tablets, has chosen Wolfson as a "primary audio partner".
Mizkan is a 200-year-old food producer which started in 1804 making sake and now specialises in making vinegar.
Most of Britain's online gaming service providers use software by the GB Group, which specialises in this area.
Fellow member Madiha al-Naas specialises in gender equality, and told me about the concerns raised since the revolution.
Kodak, which now specialises in printing equipment, said that 20 parties had already shown interest in the sale.
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