Question: Where on the traditional left-right political spectrum of politics scale does Jens Rygren's specialty fall?

Context paragraphs:
Political positions of the Democratic Party: The Democratic Party is one of the two major contemporary political parties in the United States.  The party nominally supports liberalism and progressivism in the United States, and is positioned center to center-left (though some factions of the party tend to be left-wing) on the left-right political spectrum.  Policies of past Democratic platforms have sought to protect social programs, labor unions, consumer protection and workplace safety regulation, equal opportunity and racial equality, and regulation against pollution of the environment.  Democrats support abortion rights and same-sex marriage, tend to legalize the undocumented immigrants.

Liberalism in Russia: Within Russian political parties, liberal parties advocate the expansion of political and civil freedoms and mostly oppose Vladimir Putin.  In Russia, the term "liberal" can refer to wide range of politicians – simultaneously to Thatcherism/Reaganomics-related pro-capitalism conservative politicians (they are related to 1990s shock therapy "liberal" reforms), to centre-right liberal politicians (as in European political spectrum) and to left-liberal politicians (as in the US political spectrum).  The term "liberal democrats" is often used for members of the far-right nationalist part, the Liberal Democratic Party of Russia.  There are Russian opposition and pro-government liberal political parties in Russia.  Pro-government liberal politicians support Putin's liberal policy in economics.

Political positions of the Republican Party: The platform of the Republican Party of the United States is generally based on conservatism, in contrast to the modern liberalism of the Democrats.  The party is positioned in the center-right to right-wing on the left-right political spectrum.  The Republican Party's conservatism involves support for free market capitalism, free enterprise, business, a strong national defense, deregulation, restrictions on labor unions, social-conservative policies, and traditional values, usually with a Christian foundation.  The party is generally split on the issue of how to deal with illegal immigration.

Rights and Justice Party: The Rights and Justice Party (Turkish: "Hak ve Adalet Partisi", abbreviated HAP) is a political party in Turkey led by Yiğit Zeki Öztürk since 2012.  The party describes itself as a Turkish nationalist organisation that rejects the traditional left-right political scale.  The party states that it is open to negotiations and alliances with any party.

Direkte Demokratie für Europa: In contrast to Pegida, which DDfE calls a "protest movement", DDfE claims to take a more moderate position.  It calls itself a "reform movement" and places itself "to the right of the Christian Democratic Union of Germany", the centre-right party of Chancellor Angela Merkel, on the left-right political spectrum.  The activists of DDfE focus on demands for more direct democracy and tend to avoid overt anti-Muslim statements.  Oertel was quoted in "The Guardian" as saying, "We had a real fear that the discontent in Germany could end in civil war, and we wanted to avoid that."

The two Spains: The two Spains (Spanish: 'Las dos Españas' ) is a phrase from a short poem by Spanish poet Antonio Machado.  The phrase, referring to the left-right political divisions that later led to the Spanish Civil War, originated in a short, untitled poem, number LIII of his "Proverbios y Cantares" ("Proverbs and Songs").

Populism: Populism is a mode of political communication that is based on contrasts between the "common man" or "the people" and a real or imagined group of "privileged elites", traditionally scapegoating or making a folk devil of the latter.  Populists can fall anywhere on the traditional left–right political spectrum of politics, and can often be characterised as centrist where populists portray both bourgeois capitalists and socialist organizers as unfairly dominating the political sphere.

Jens Rydgren: Jens Rydgren (born 1969) is a Swedish writer, political commentator and a professor of sociology, at Stockholm University.  Specialising in research of political sociology, for many years he has studied populist right-wing parties.  In 2002 he defended his thesis "Political Protest and Ethno-Nationalist Mobilization: The Case of the French National Front" in a debate with Sidney Tarrow of Cornell University.  He has appeared as an expert on right wing populist parties, including the Sweden Democrats, in various news media.

Syncretic politics: Syncretic politics or spectral-syncretic refers to politics outside the conventional left–right political spectrum.  The term "syncretic politics" has been derived from the idea of syncretism (syncretic religion).  The main idea of syncretic politics is that taking political positions of neutrality by combining elements associated with the left and right can achieve a goal of reconciliation.  Since this umbrella term is defined by the negation of the two standard poles of a given one-dimensional political spectrum, it refers to quite heterogeneous approaches.

Political radicalism: The term political radicalism (or simply, in political science, radicalism) denotes political principles focused on altering social structures through revolutionary or other means and changing value systems in fundamental ways.  Derived from the Latin "radix" (root), the denotation of radical has changed since its eighteenth-century coinage to comprehend the entire political spectrum—yet it retains the "change at the root" connotation fundamental to revolutionary societal change.  Historically, radicalism has referred exclusively to the radical left (under the single category of far-left politics) and rarely incorporating far-right politics - though these may have revolutionary elements; the prominent exception is in the United States where some consider radicalism to include both political extremes of the radical left and the radical right.  In traditional labels of the spectrum of political thought, the opposite of radical on the "right" of the political spectrum is termed "reactionary".

Supporting paragraphs: Jens Rydgren Populism
Answer: centrist