Denis has appeared on 25 television channels and over 10 radio stations, been a speaker at more than 40 scientific conferences, and has received numerous awards and recognitions from festivals, competitions, educational institutions, museums, cultural communities, and city authorities. His YouTube channel features over 100 videos covering a wide range of topics.

He lectures on various subjects, particularly in the musical field, focusing on figures connected to his family by familial or friendly relations—such as Tchaikovsky, Debussy, Nikolai Rubinstein, Wieniawski, and Pakhulsky. Outside of music, his distant ancestors include notable historical figures like His Serene Highness Prince Potemkin, several colonels and generals from 1812, the Decembrists, founders of private railways known as the "railway kings," patrons, and philanthropists, including confidants of members of the imperial Romanov family.

Following the communist revolution, many of his ancestors faced significant hardships, including executions, imprisonment, and exile. During the Soviet Union, mentioning some of his noble ancestors—who were considered enemies of the Soviet people—was forbidden.

Denis's lectures not only recount historical times but also draw parallels with modern life, aiming to apply high standards of familial and societal relations. By selecting life-affirming quotes from great figures, he promotes a path of personal development. This is a vital factor in the education of children and young people.

He is currently one of the closest living relatives of the eminent Russian composer Pyotr Ilyich Tchaikovsky, who, besides his world-renowned music, left behind a colossal literary and epistolary legacy—larger in volume than that of Anton Chekhov. His ancestors are known for translating Tchaikovsky's letters and creating compelling family memoirs, which Denis expands and republishes with new historical discoveries and illustrations through his archival work. He is the keeper of the family history and the most knowledgeable member among all the descendants in the genealogical tree, both past and present.

Denis von Meck is a blood relative of both Pyotr Ilyich Tchaikovsky and Nadezhda von Meck. He descends from the marriage between Tchaikovsky's niece, Anna Davydova, and Nikolay von Meck, the son of Nadezhda von Meck. This union established a direct familial connection between the Tchaikovsky and von Meck families, highlighting the close ties between the composer and his patroness. Among the many descendants related to Tchaikovsky, Denis belongs to a particularly intriguing lineage that underscores the deep family bonds forged between these two prominent Russian families.

Denis graduated from university as an engineer and worked for many years as a manager in manufacturing and construction companies. For the past 10 years, however, he has been fully dedicated to educational activities, during which he has completed about 20 different courses in history and culture at various prestigious educational institutions.

His role as President of the Foundation as well as in all other public organizations is a volunteer position for which he does not receive monetary compensation. For his livelihood, he works as a fire safety consultant.