Guido Pella, born on May 17, 1990, is a former professional tennis player from Argentina who achieved a career-high world ranking of No. 20 in singles and No. 55 in doubles. His journey in tennis began under the guidance of his father, Carlos, at the age of five, and his sister, Catalina, is also a tennis player. Pella's personal life includes an engagement to model and entrepreneur Stephanie Demner. In his junior career, he reached the semifinals of the French Open boys' singles in 2008. Pella's professional career saw significant milestones, including winning his first ATP title at the 2019 Brasil Open and reaching the quarterfinals of Wimbledon in the same year. He also made an impact in doubles, reaching the semifinals of the 2019 French Open and achieving a career-high ranking of No. 56. Pella's career was affected by a diagnosis of Morton's neuroma, leading to an indefinite hiatus from the sport in 2020. Despite his career being cut short, Pella's achievements and contributions to the tennis world remain a significant part of his legacy.

Guido Adler (1 November 1855 – 15 February 1941) was a renowned Moravian-Austrian musicologist and writer. Born in Eibenschütz, Moravia, to Jewish parents, he later moved to Vienna where he pursued his education. Adler's academic journey encompassed studies at the University of Vienna and the Vienna Conservatory of Music, where he was mentored by notable figures such as Anton Bruckner and Otto Dessoff.Adler's significant contributions to the field of musicology include his pioneering role in establishing the discipline and his emphasis on sociocultural factors in music. He is recognized for founding the Vierteljahresschrift für Musikwissenschaft (Musicology Quarterly) in 1884 and for his influential work on the division of musicology into historical and systematic subdisciplines. Notably, he also established the Musikwissenschaftliches Institut at the University of Vienna, where he taught and influenced several prominent figures in music, including composers like Anton Webern and Egon Wellesz.However, the onset of the National Socialist period in 1938 forced Adler to resign from his editorial position and eventually led to his passing in 1941. Despite these challenges, his impact on musicology remains significant, particularly in his emphasis on empirical study and his contributions to the understanding of Austrian music.Adler's legacy lives on through his enduring influence on music scholarship and the preservation of his extensive library, which is housed in esteemed institutions

Guido Beck (29 August 1903 – 21 October 1988) was an influential Argentine physicist of German Bohemian origin, known for his groundbreaking discoveries in general relativity. After studying physics in Vienna and working with prominent scientists such as Werner Heisenberg and Ernest Rutherford, Beck's career took him to various countries, including the Soviet Union, France, Portugal, Argentina, and Brazil. Notably, his time in Argentina and Brazil saw him mentor and train numerous physicists, leaving a lasting impact on the development of physics in South America. He was also recognized for his contributions to the theory of beta-decay. In 1977, he received an honorary doctoral degree from the Darmstadt University of Technology in Germany for his exceptional academic achievements and dedication to establishing research institutions in physics. Tragically, Beck's life was cut short in 1988 when he passed away in a car accident in Rio de Janeiro. His legacy continues to inspire and influence the world of physics.

Guido Leopold Weiss (29 December 1928–25 December 2021) was an influential American mathematician renowned for his work in analysis, particularly Fourier analysis and harmonic analysis. Born into a Jewish family in Trieste, Italy, Weiss faced obstacles in his education due to Italy's Italian Racial Laws. His family later emigrated to the United States, where he pursued his academic journey. Weiss earned his master's degree and PhD from the University of Chicago, and subsequently held various academic positions, including a professorship at Washington University in St. Louis. Throughout his career, he made significant contributions to the field of mathematics, earning accolades such as the Chauvenet Prize and honorary doctorates from prestigious institutions. Weiss collaborated on influential works, including "Introduction to Fourier Analysis on Euclidean spaces" with Elias Stein and "A first course on Wavelets" with Eugenio Hernandez. His profound impact on the field of mathematics is widely celebrated.

Guido Lorraine (2 September 1912 – 31 December 2009) was a Polish-born actor, musician, and singer, best known for his performances in war films and his contributions to the entertainment industry. Born Gwidon Alfred Gottlieb in Kraków, Poland, he honed his musical talents from a young age, eventually founding a military theatre group during World War II. Lorraine's career spanned twenty-eight films, numerous theatre productions, and appearances on BBC radio, television, and film. He also made significant contributions to the Polish community in Australia through his performances and television show. Notably, he was the first singer to perform the song "Red Poppy Flowers of Monte Cassino" in public. After adopting the stage name Guy Borucki, he moved to London and continued to make a mark in the entertainment world. Lorraine's film credits include Hotel Sahara, The Colditz Story, and Blue Murder at St Trinian's, as well as various musical comedies and British productions. He enriched Australia's entertainment scene with his musical operetta performances and television show, leaving a lasting impact on the industry. Guido Lorraine passed away in Melbourne, Australia, at the age of 97, leaving behind a legacy of talent and dedication to his craft.