One of the most important figures in the town's history was Wilhelm Greil (1850 - 1923). From 1896 to 1923, the entrepreneur held the office of mayor, having previously helped to shape the city's fortunes as deputy mayor. It was a time of growth, the incorporation of entire neighbourhoods, technical innovations, new media and previously unimaginable social and political upheavals.

The second half of the 19th century was characterised by a political struggle between liberal and conservative forces. Unlike in the rest of the Tyrol, the conservatives had a hard time in Innsbruck, whose population had been in favour of liberal ideas since the Napoleonic era. Each side not only had politicians, but also associations and their own newspapers. Taxes, social policy, education, housing and the organisation of public space were discussed with passion and zeal. Due to an electoral system based on voting rights via property classes, only around 10% of the entire population of Innsbruck could go to the ballot box. Relative suffrage applied within the three electoral bodies, which means as much as: The winner takes it all. Mass parties such as the Social Democrats were unable to assert themselves until the electoral law reform of the First Republic. Mayors like Greil could rely on 100% support in the municipal council, which naturally made decision-making and steering much easier.

Greil belonged to the "Deutschen Volkspartei", a liberal and national-Great German party. What appears to us today as a contradiction, liberal and national, was a politically common and well-functioning pair of ideas in the 19th century. Pan-Germanism was not a political peculiarity of a radical right-wing minority, but rather a centrist trend, particularly in German-speaking cities of the Reich, which was important in varying forms through almost all parties until after the Second World War. Whoever issues the liberal Innsbrucker Nachrichten of the period around the turn of the century, you will find countless articles in which the common ground between the German Reich and the German-speaking countries was made the topic of the day.

Greil was a skilful politician who operated within the predetermined power structures of his time. He knew how to skilfully manoeuvre around the traditional powers, the monarchy and the clergy, and how to come to terms with them. The period leading up to the First World War was characterised by a general economic boom. This gave him a great deal of room for manoeuvre. Under him, the city purchased land with foresight in the style of a merchant in order to make projects possible. Under Wilhelm Greil, Innsbruck expanded at a rapid pace. The politician Greil was able to rely on the civil servants and town planners Eduard Klingler, Jakob Albert and Theodor Prachensky for the major building projects of the time. Infrastructure projects such as the new town hall in Maria-Theresienstraße in 1897, the Hungerburg railway in 1906 and the Karwendelbahn were realised. Other milestones included the renovation of the market square and the construction of the market hall.

Much of what was pioneered in the second half of the 19th century is part of everyday life today. For the people of that time, however, these things were a real sensation and life-changing. The four decades between the economic crisis of 1873 and the First World War were characterised by unprecedented economic growth and rapid modernisation. The city's economy boomed. Businesses were founded in Pradl and Wilten and attracted workers. Tourism also brought fresh capital into the city. At the same time, however, the concentration of people in a confined space under sometimes precarious hygiene conditions also brought problems. The outskirts of the city in particular were repeatedly plagued by typhus.

His predecessor, Mayor Heinrich Falk (1840 - 1917), had already contributed significantly to the modernisation of the town and the settlement of Saggen. Since 1859, the lighting of the city with gas pipelines had progressed steadily. Between 1887 and 1891, Innsbruck was equipped with a modern high-pressure water pipeline, which could also be used to supply flats on higher floors with fresh water. Wilhelm Greil arranged for the gas works in Pradl and the electricity works in Mühlau to be taken over into municipal ownership. The street lighting was converted to electric light.

Greil was able to secure Innsbrucker Renaissance on patrons from the town's middle classes. Baron Johann von Sieberer donated the old people's asylum and the orphanage in Saggen. Leonhard Lang donated the building, previously used as a hotel, to which the town hall moved from the old town in 1897, in return for the town's promise to build a home for apprentices.

Even before the First World War, there were changes in everyday politics. The first free elections within the k.u.k. Monarchy to the Imperial Council for all male citizens in 1907 changed the social rules of the game. In his final years in office, Greil accompanied Innsbruck through the transition from the Habsburg Monarchy to the Republic, through years characterised above all by hunger, misery, scarcity of resources and insecurity. He was 68 years old when Italian troops occupied the city after the First World War and Tyrol was divided at the Brenner Pass, which was particularly bitter for him as a representative of German nationalism.

In 1928, former mayor Greil died as an honorary citizen of the city of Innsbruck at the age of 78. Wilhelm-Greil-Straße was named after him during his lifetime.