His organ with symphony orchestra concerto debut was in 1984 at Chicago's Orchestra Hall performing Handel's Concerto No. 13 in F, "The Cuckoo and the Nightingale," with the Chicago Symphony Orchestra. His many European concert tours have featured several return engagements at Vienna's famed Konzerthaus (next, May 12, 2007) to perform at the historic 5-manual Rieger concert pipe organ including a featured all-Europe organ convention performance appearing in recital with renowned French concert organist Marie-Claire Alain. In recent seasons he has had his Sydney Opera House concert hall debut (three sellout performances) and was the premier performer for the Singapore Esplanade Concert Hall pipe organ.

For over forty years Dennis James has played a pivotal role in the international revival of silent films with live music. Beginning as an accompanist for university screenings, James now tours worldwide under auspices of his Silent Film Concerts production company presenting professional silent film programs with accompaniments ranging from solo piano or theatre organ, to chamber ensembles and full symphony orchestras. Performing to film at an ever-increasing number of sites throughout the world, James is celebrated for providing the most comprehensive selection of authentic silent films with live music presentations available today. James recently performed sellout silent film programs with the Chicago Symphony Orchestra at Orchestra Hall and the Dallas Symphony Orchestra at Meyerson Symphony Center, and his international silent film presentations have been seen most recently in Canada, Mexico, Australia, New Zealand, England , Singapore, France, Germany, Austria, The Netherlands, and Italy.

A featured solo performer on the international film festival circuit, James appears regularly at the annual Los Angeles, San Francisco, Washington D.C. and Philadelphia events as well as the Pordenone and Rome (Italy) Festivals Cinema Muto. He may be seen frequently at the National Gallery of Art, the Walker Film Center in Minneapolis, the Cleveland Cinematheque and for the Chicago Art Institute, the Louvre Museum in Paris, and the Palazzo Delle Esposizioni in Rome. James has performed programs under the auspices of the American Film Institute, National Film Registry, Museum of Modern Art, Library of Congress, Pacific Film Archive, George Eastman House, American Federation of the Arts, UCLA Film and Television Archive and the British Film Institute.

Dennis James currently serves three simultaneous professional positions: 1) House Organist for Seattle's Paramount Theatre; 2) House Organist for the Historic Everett Theatre; 3) Theatre Organist for the San Diego Symphony.  He also appears regularly as silent film organist for the Stanford Theatre in Palo Alto, California Theatre in San Jose, Castro Theatre in San Francisco, and the Uptown Theatre in Calgary, Canada. James' career has included such professional appointments ranging from House Organist at the Lansdowne and Brookline Theaters in Pennsylvania, the Paramount and Rivoli Theaters in Indiana, and the final employed Resident Organist for the national landmark Ohio Theatre in Columbus. James performs frequently at various California locations including the State Theatre (Monterey), Arlington Theatre (Santa Barbara), Paramount Theatre (Oakland), Berkeley Community Theatre and annually at the famous outdoor Spreckels Concert Organ in Balboa Park (San Diego). James also maintains a long-term performing relationship at New York's "Showplace of the Nation," Radio City Music Hall, that includes solo organ concerts, variety performances, and multiple appearances with orchestras in accompaniment to silent films.

In a professionally diverse career, James has played organs together with professional, semi-professional, academic and community symphony orchestras, “pops” orchestras, chamber orchestras, symphonic wind band ensembles, tuba ensembles, marching bands presented in concert, percussion ensembles, brass & percussion groups with dancing cheerleaders & flag corps, Scottish pipers, stage & show orchestras, swing bands (Thirties to Fifties), nostalgia bands (Dixieland, Ragtime, Traditional Jazz, Novelty, Twenties recreation), country-western, vocal soloists (classical, opera, Broadway current and past, commercial popular groups playing 50’s, 60’s, 70’s through current tunes), wedding bands, choirs (church, show, theme, etc.), rock groups, solo instrumentalists of all sorts and combinations, ballet troupes, fashion shows, magicians, puppeteers, children’s theatre shows, celebrity actors and narrators, onstage fireworks demonstrations, burlesque, film exhibition, and even a troupe of professional Viennese ballroom-show dancers in a televised variety concert from the Konzerthaus in Vienna.

Dennis James' educational activities currently include his ongoing appointment as Research Fellow at the University of South Carolina and guest lecturer for universities nationwide, e.g. Stanford University in Palo Alto. He has been an artist-in-residence at the Flint Institute of Music and was the debut Theatre Organ Workshop artist for the Granada Theatre Historical Society. James has served as adjudicator for numerous organ-playing competitions, including the London, England "Young Organist of the Year" plus various American Theatre Organ Society local and national contests. An experienced composer and arranger, James has seven record album and five compact disc solo issues to his credit. He has been the subject of several national broadcasts over NBC, ABC, CBS, PBS and NPR radio and television. James has been profiled in a feature television documentary for the Australian Broadcast Commission, played full length solo concerts over national Austrian and Italian television and has appeared on numerous radio broadcasts for the BBC in England, the CBC in Canada, French, Austrian Italian and Belgian national radio networks.