Harry Dalton's career in Major League Baseball is characterized by his extensive work as a front office executive, where he played a vital role in shaping several teams over the decades. Dalton began his journey in baseball with the Baltimore Orioles, where he initially worked in the team's farm system. His keen eye for talent and understanding of the game quickly propelled him through the ranks.

In 1966, Dalton was appointed as the Orioles' Director of Player Personnel. During his tenure, the Orioles became one of the most successful teams in baseball, winning the World Series in 1966 and again in 1970. Dalton's ability to identify and develop talent was instrumental in building a team that included future Hall of Famers such as Jim Palmer, Brooks Robinson, and Frank Robinson. His strategic acumen and leadership were widely recognized, and he was soon promoted to General Manager in 1971.

Dalton's success with the Orioles caught the attention of other teams, and in 1972, he was hired by the California Angels as their General Manager. His time with the Angels was marked by efforts to rebuild the team and make them competitive in the American League. Although the Angels did not achieve the same level of success as the Orioles during Dalton's tenure, he laid the groundwork for future improvements by focusing on player development and scouting.

In 1977, Dalton took on the role of General Manager for the Milwaukee Brewers. It was with the Brewers that he achieved some of his most memorable accomplishments. Dalton's leadership helped transform the Brewers into a competitive team in the late 1970s and early 1980s. Under his guidance, the Brewers reached the postseason for the first time in 1981 and advanced to the World Series in 1982, where they faced the St. Louis Cardinals. Although the Brewers fell short in the seven-game series, Dalton's efforts in assembling a talented roster were widely praised.

Dalton's tenure with the Brewers lasted until 1991, during which he continued to focus on building a strong team through strategic trades and player acquisitions. His ability to navigate the complexities of team management and his dedication to fostering a winning culture left a lasting legacy in Milwaukee.

Throughout his career, Harry Dalton was known for his strategic thinking and ability to build competitive teams.