Every 12 months, the editors of Art+Auction assemble a list of the individuals who have stood out in the art world over the last year, and publish our results as our Power List. On December 2, we published our Introduction, explaining the thinking that went into this year's list and our process of judging. Today, we offer the second of nine installments to be published on ARTINFO, of power figures who follow a long legacy of artworld dealings: “Power of Tradition.”

POWER OF TRADITION -Ben Janssens

The owner of Ben Janssens Oriental Art, London, has been a major force in expanding the annual TEFAF Maastricht. Having paved the way for younger dealers to exhibit at the fair in 2008, the Chinese antiquities specialist and TEFAF chairman introduced a section for 20th-century design in 2009 and one for works on paper in 2010. For this year’s edition, Janssens led the effort to attract more Asian buyers to the well-established fair, embarking on what he says was a successful “mission to China, to bring Chinese to Maastricht.”

POWER OF TRADITION -Connery, Pissarro, Seydoux

A new enterprise that aroused instant Rolodex envy in the world of private advising sprang up this past summer following the departures of Impressionist/modern rainmakers Stephane Connery and Thomas Seydoux from Sotheby’s and Christie’s, respectively. Paris husband-and-wife dealers Lionel and Sandrine Pissarro, fresh from the recently disbanded private dealership Giraud Pissarro Ségalot, joined the duo to create arguably the dream team of private-sale professionals, with unparalleled access to the elite and secretive club of billionaire collectors, from Gulf region sheikhs to Russian oligarchs.

POWER OF TRADITION -Emmanuel Di Donna

Since teaming up with Harry Blain in late 2010 to form the secondary-market art dealership Blain Di Donna, the 40-year- old former vice chair of the Impressionist and modern department at Sotheby’s has mounted a series of specialty solo exhibitions by a host of Surrealist masters in the gallery’s elegant Carlyle Hotel space. But these carefully researched and difficult-to-source exhibitions are accessory to the larger mission of crafting private sales to international clients who by and large prefer the assured anonymity of discreet buying and selling.

POWER OF TRADITION -Fabrizio Moretti

As the youngest member of Maastricht’s executive committee and an early champion of the inaugural Frieze Masters, 36-year-old Moretti is working hard to find a place for Old Masters in the contemporary art–dominated fair landscape. He recently formed TEFAF’s young dealers committee, which seeks to usher up-and-coming galleries into the ranks of the traditional fair. And the dealer, with spaces in Florence, London, and New York, gets around: he also participated in the Shanghai Fine Jewellery and Art Fair, testing the Asian market for European Old Masters; and the Biennale des Antiquaires in Paris, where he sold a 15th-century panel depicting the Virgin and Child for $1.2 million.

POWER OF TRADITION -Bob Haboldt

Neophytes interested in Old Masters could do worse than to place themselves under the tutelage of Haboldt, whose track record is documented in a tome chronicling 30 years of sales from his venues in Amsterdam, New York, and Paris. His keen eye has led him to handle works from such diverse talents as Rembrandt pupil Samuel van Hoogstraten and Jackson Pollock. A promoter of Old Masters among the emerging generation of collectors, Haboldt cofounded the Paris Tableau fair as yet another outlet for sharing his discoveries with an ever broader audience.

POWER OF TRADITION -Jonathan Green

The latest chapter in the tale of the Richard Green British art empire is a six-story building on Bond Street next to Sotheby’s — a purpose-built temple for modern British art — that opened in fall 2011. Green’s son Jonathan, deputy executive chairman of the galleries, spearheaded the expanded focus on works by artists such as Frank Auerbach and Patrick Heron, who he says have been undervalued for some time. The expansion comes after five decades of specializing in works ranging from Old Masters to 19th-century sporting art and Impressionism.

POWER OF TRADITION -Robert Landau

Since launching his Montreal space in 1987, Landau has focused on works by early to mid 20th-century masters such as Picasso, Dubuffet, and Giacometti. As the sources for top examples by such artists grow thinner, Landau Fine Art maintains its place in the upper echelons by snapping up works for inventory at upwards of $25 million a pop. In 2012 Landau and his wife, Alice, emigrated to Switzerland, where they plan to open a private gallery in Meggen, near Lucerne.

POWER OF TRADITION -Sam Fogg

The veteran British Old Masters dealer kicked off the year in New York, where he presented a rare American exhibition of late 15th-century panel paintings at Richard L. Feigen & Co. Accompanied by one of the first English-language catalogues on the subject, the show spotlighted artists working outside the better-known medieval centers of Italy and the southern Netherlands. Fogg also drew widespread praise at Frieze Masters in October for his booth, which included three monumental 13th-century gargoyles that once clung to the roof of the Haguenau cathedral in Germany; the display helped him sell five works within the fair’s first three hours.

POWER OF TRADITION -The Acquavella Family

Since Acquavella Galleries’ founding in 1921 by the late Nicholas Acquavella, the art dealing enterprise has been a family affair, with son William Acquavella now heading the firm. The younger generation, namely Eleanor, Nicholas, and Alexander, has reenergized the 91-year-old gallery and assured its stability for decades to come. The Acquavellas stand out among family art dynasties, maintaining a kind of old-world atmosphere in their East 79th Street town house while sharpening that blue-chip profile with newer blood, representing contemporary painters alongside midcentury icons like James Rosenquist, long a member of the stable.